diff --git a/website/docs/configuration.md b/website/docs/configuration.md
index 575fe51b90..38409bb5ef 100644
--- a/website/docs/configuration.md
+++ b/website/docs/configuration.md
@@ -54,7 +54,7 @@ Wave can be configured via configuration (`.env`) file, environment variables or
 | H2O_WAVE_TLS_KEY_FILE                  | -tls-key-file string                  | path to private key file (TLS only)                                                                                                                                                                                                                                                                                  |
 | H2O_WAVE_NO_TLS_VERIFY [^1]            | -no-tls-verify                        | do not verify TLS certificates during external communication - DO NOT USE IN PRODUCTION                                                                                                                                                                                                                              |
 |                                        | -version                              | print version and exit                                                                                                                                                                                                                                                                                               |
-| H2O_WAVE_KEEP_APP_LIVE [^1]   | -keep-app-live          | do not unregister unresponsive apps (default false)                                                                                                                                                                                                                                                                                 |
+| H2O_WAVE_KEEP_APP_LIVE [^1]            | -keep-app-live                        | do not unregister unresponsive apps (default false)                                                                                                                                                                                                                                                                  |
 | H2O_WAVE_WEB_DIR                       | -web-dir string                       | directory to serve web assets from (default "./www")                                                                                                                                                                                                                                                                 |
 | H2O_WAVE_CONF                          | -conf string                          | path to a configuration file (default ".env")                                                                                                                                                                                                                                                                        |
 [^1]: `1`, `t`, `true` to enable; `0`, `f`, `false` to disable (case insensitive).