diff --git a/file.php b/file.php
index 2c63472..ba8ddeb 100644
--- a/file.php
+++ b/file.php
@@ -38,6 +38,8 @@ class local_moodlecheck_file {
     protected $tokens = null;
     protected $tokenscount = 0;
     protected $classes = null;
+    protected $interfaces = null;
+    protected $traits = null;
     protected $functions = null;
     protected $filephpdocs = null;
     protected $allphpdocs = null;
@@ -61,6 +63,8 @@ protected function clear_memory() {
         $this->tokens = null;
         $this->tokenscount = 0;
         $this->classes = null;
+        $this->interfaces = null;
+        $this->traits = null;
         $this->functions = null;
         $this->filephpdocs = null;
         $this->allphpdocs = null;
@@ -172,22 +176,27 @@ public function &get_tokens() {
     }
 
     /**
-     * Returns all classes found in file
+     * Returns all artifacts (classes, interfaces, traits) found in file
      *
-     * Returns array of objects where each element represents a class:
-     * $class->name : name of the class
-     * $class->tagpair : array of two elements: id of token { for the class and id of token } (false if not found)
-     * $class->phpdocs : phpdocs for this class (instance of local_moodlecheck_phpdocs or false if not found)
-     * $class->boundaries : array with ids of first and last token for this class
+     * Returns 3 arrays (classes, interfaces and traits) of objects where each element represents an artifact:
+     * ->type : token type of the artifact (T_CLASS, T_INTERFACE, T_TRAIT)
+     * ->name : name of the artifact
+     * ->tagpair : array of two elements: id of token { for the class and id of token } (false if not found)
+     * ->phpdocs : phpdocs for this artifact (instance of local_moodlecheck_phpdocs or false if not found)
+     * ->boundaries : array with ids of first and last token for this artifact.
      *
-     * @return array
+     * @return array with 3 elements (classes, interfaces & traits), each being an array.
      */
-    public function &get_classes() {
+    public function get_artifacts() {
+        $types = array(T_CLASS, T_INTERFACE, T_TRAIT); // We are interested on these.
+        $artifacts = array_combine($types, $types);
         if ($this->classes === null) {
             $this->classes = array();
+            $this->interfaces = array();
+            $this->traits = array();
             $tokens = &$this->get_tokens();
             for ($tid = 0; $tid < $this->tokenscount; $tid++) {
-                if ($this->tokens[$tid][0] == T_CLASS) {
+                if (isset($artifacts[$this->tokens[$tid][0]])) {
                     if ($this->previous_nonspace_token($tid) === "::") {
                         // Skip use of the ::class special constant.
                         continue;
@@ -211,17 +220,41 @@ public function &get_classes() {
                             continue;
                         }
                     }
-                    $class = new stdClass();
-                    $class->tid = $tid;
-                    $class->name = $this->next_nonspace_token($tid);
-                    $class->phpdocs = $this->find_preceeding_phpdoc($tid);
-                    $class->tagpair = $this->find_tag_pair($tid, '{', '}');
-                    $class->boundaries = $this->find_object_boundaries($class);
-                    $this->classes[] = $class;
+                    $artifact = new stdClass();
+                    $artifact->type = $artifacts[$this->tokens[$tid][0]];
+                    $artifact->tid = $tid;
+                    $artifact->name = $this->next_nonspace_token($tid);
+                    $artifact->phpdocs = $this->find_preceeding_phpdoc($tid);
+                    $artifact->tagpair = $this->find_tag_pair($tid, '{', '}');
+                    $artifact->boundaries = $this->find_object_boundaries($artifact);
+                    switch ($artifact->type) {
+                        case T_CLASS:
+                            $this->classes[] = $artifact;
+                            break;
+                        case T_INTERFACE:
+                            $this->interfaces[] = $artifact;
+                            break;
+                        case T_TRAIT:
+                            $this->traits[] = $artifact;
+                            break;
+                    }
                 }
             }
         }
-        return $this->classes;
+        return array(T_CLASS => $this->classes, T_INTERFACE => $this->interfaces, T_TRAIT => $this->traits);
+    }
+
+    /**
+     * Returns all classes found in file
+     *
+     * Returns array of objects where each element represents a class:
+     * $class->name : name of the class
+     * $class->tagpair : array of two elements: id of token { for the class and id of token } (false if not found)
+     * $class->phpdocs : phpdocs for this class (instance of local_moodlecheck_phpdocs or false if not found)
+     * $class->boundaries : array with ids of first and last token for this class
+     */
+    public function &get_classes() {
+        return $this->get_artifacts()[T_CLASS];
     }
 
     /**
diff --git a/rules/phpdocs_basic.php b/rules/phpdocs_basic.php
index 722543f..096b8f0 100644
--- a/rules/phpdocs_basic.php
+++ b/rules/phpdocs_basic.php
@@ -70,6 +70,11 @@ function local_moodlecheck_noemptysecondline(local_moodlecheck_file $file) {
  * @return array of found errors
  */
 function local_moodlecheck_filephpdocpresent(local_moodlecheck_file $file) {
+    // This rule doesn't apply if the file is 1-artifact file (see #66).
+    $artifacts = $file->get_artifacts();
+    if (count($artifacts[T_CLASS]) + count($artifacts[T_INTERFACE]) + count($artifacts[T_TRAIT]) === 1) {
+        return array();
+    }
     if ($file->find_file_phpdocs() === false) {
         $tokens = &$file->get_tokens();
         for ($i = 0; $i < 30; $i++) {
diff --git a/tests/fixtures/phpdoc_file_required_no1.php b/tests/fixtures/phpdoc_file_required_no1.php
new file mode 100644
index 0000000..98f1a57
--- /dev/null
+++ b/tests/fixtures/phpdoc_file_required_no1.php
@@ -0,0 +1,24 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * This is a dummy class without any tags.
+ */
+class dummy_class_without_tags {
+    // As far as this is an 1-artifact file, the file phpdoc block is not required.
+}
diff --git a/tests/fixtures/phpdoc_file_required_no2.php b/tests/fixtures/phpdoc_file_required_no2.php
new file mode 100644
index 0000000..1c40b9a
--- /dev/null
+++ b/tests/fixtures/phpdoc_file_required_no2.php
@@ -0,0 +1,24 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * This is a dummy interface without any tags.
+ */
+interface dummy_class_without_tags {
+    // As far as this is an 1-artifact file, the file phpdoc block is not required.
+}
diff --git a/tests/fixtures/phpdoc_file_required_no3.php b/tests/fixtures/phpdoc_file_required_no3.php
new file mode 100644
index 0000000..b1b6323
--- /dev/null
+++ b/tests/fixtures/phpdoc_file_required_no3.php
@@ -0,0 +1,24 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * This is a dummy trait without any tags.
+ */
+trait dummy_class_without_tags {
+    // As far as this is an 1-artifact file, the file phpdoc block is not required.
+}
diff --git a/tests/fixtures/phpdoc_file_required_yes1.php b/tests/fixtures/phpdoc_file_required_yes1.php
new file mode 100644
index 0000000..e4fc5d8
--- /dev/null
+++ b/tests/fixtures/phpdoc_file_required_yes1.php
@@ -0,0 +1,29 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * This is a dummy class without any tags.
+ */
+class dummy_class_without_tags {
+}
+
+/**
+ * This is another dummy class without any tags. Hence, file phpdoc block is required.
+ */
+class dummy2_class_without_tags {
+}
diff --git a/tests/fixtures/phpdoc_file_required_yes2.php b/tests/fixtures/phpdoc_file_required_yes2.php
new file mode 100644
index 0000000..8cc73f9
--- /dev/null
+++ b/tests/fixtures/phpdoc_file_required_yes2.php
@@ -0,0 +1,23 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+// This is library-style php file, no classes around.
+
+function dummy_function_without_tags() {
+    // No classes, hence the file phpdoc block is required.
+}
diff --git a/tests/fixtures/phpdoc_file_required_yes3.php b/tests/fixtures/phpdoc_file_required_yes3.php
new file mode 100644
index 0000000..70a593c
--- /dev/null
+++ b/tests/fixtures/phpdoc_file_required_yes3.php
@@ -0,0 +1,29 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * This is a dummy interface without any tags.
+ */
+interface dummy_class_without_tags {
+}
+
+/**
+ * This is a dummy trait without any tags. Hence, file phpdoc block is required.
+ */
+trait dummy2_class_without_tags {
+}
diff --git a/tests/moodlecheck_rules_test.php b/tests/moodlecheck_rules_test.php
index c1820f7..8f88889 100644
--- a/tests/moodlecheck_rules_test.php
+++ b/tests/moodlecheck_rules_test.php
@@ -75,6 +75,45 @@ public function test_constantclass() {
         $this->assertStringNotContainsString('classesdocumented', $result);
     }
 
+    /**
+     * Assert that the file block is required for old files, and not for 1-artifact ones.
+     */
+    public function test_file_block_required() {
+        global $PAGE;
+
+        $output = $PAGE->get_renderer('local_moodlecheck');
+
+        // A file with multiple classes, require the file phpdoc block.
+        $path = new local_moodlecheck_path('local/moodlecheck/tests/fixtures/phpdoc_file_required_yes1.php', null);
+        $result = $output->display_path($path, 'xml');
+        $this->assertStringContainsString('File-level phpdocs block is not found', $result);
+
+        // A file without any class (library-like), require the file phpdoc block.
+        $path = new local_moodlecheck_path('local/moodlecheck/tests/fixtures/phpdoc_file_required_yes2.php', null);
+        $result = $output->display_path($path, 'xml');
+        $this->assertStringContainsString('File-level phpdocs block is not found', $result);
+
+        // A file with one interface and one trait, require the file phpdoc block.
+        $path = new local_moodlecheck_path('local/moodlecheck/tests/fixtures/phpdoc_file_required_yes3.php', null);
+        $result = $output->display_path($path, 'xml');
+        $this->assertStringContainsString('File-level phpdocs block is not found', $result);
+
+        // A file with only one class, do not require the file phpdoc block.
+        $path = new local_moodlecheck_path('local/moodlecheck/tests/fixtures/phpdoc_file_required_no1.php', null);
+        $result = $output->display_path($path, 'xml');
+        $this->assertStringNotContainsString('File-level phpdocs block is not found', $result);
+
+        // A file with only one interface, do not require the file phpdoc block.
+        $path = new local_moodlecheck_path('local/moodlecheck/tests/fixtures/phpdoc_file_required_no2.php', null);
+        $result = $output->display_path($path, 'xml');
+        $this->assertStringNotContainsString('File-level phpdocs block is not found', $result);
+
+        // A file with only one trait, do not require the file phpdoc block.
+        $path = new local_moodlecheck_path('local/moodlecheck/tests/fixtures/phpdoc_file_required_no3.php', null);
+        $result = $output->display_path($path, 'xml');
+        $this->assertStringNotContainsString('File-level phpdocs block is not found', $result);
+    }
+
     /**
      * Assert that classes do not need to have any particular phpdocs tags.
      */