diff --git a/docs/conf.py b/docs/conf.py
index 63d8c7f..89eb6ef 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,5 +1,9 @@
 from crate.theme.rtd.conf.sql_99 import *
 
+html_theme_options.update({
+    "canonical_url": "https://sql-99.readthedocs.io",
+})
+
 # Disable version chooser.
 html_context.update({
     "display_version": False,