diff --git a/docs/configuration.rst b/docs/configuration.rst
index f7dddf05..a5d89d53 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -3095,9 +3095,13 @@ Type
 Default
     ``true``
 Description
-    Check the file headers of ``jpg``, ``png``, and ``gif`` files
+    Check file headers of downloaded files
     and adjust their filename extensions if they do not match.
 
+    For example, this will change the filename extension (``{extension}``)
+    of a file called ``example.png`` from ``png`` to ``jpg`` when said file
+    contains JPEG/JFIF data.
+
 
 downloader.http.headers
 -----------------------