diff --git a/doc/configuration.rst b/doc/configuration.rst
index 403ea107..b53de3f1 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -106,6 +106,8 @@ the comments to get the meaning of each option.
     ; background luminance, used by terminal frontends
     ; can be "auto" (default) to autodetect, "dark" or "light"
     background = auto
+    # end-user facing URL, used by Web frontend
+    public_url = example.com
 
     [plugin account]
     ; where a new account must be created