diff --git a/doc/manual/generate-manpage.nix b/doc/manual/generate-manpage.nix
index 21a4802e5..41725aed6 100644
--- a/doc/manual/generate-manpage.nix
+++ b/doc/manual/generate-manpage.nix
@@ -110,6 +110,7 @@ let
                 ${option.description}
             '';
           categories = mapAttrs
+            # Convert each group from a list of key-value pairs back to an attrset
             (_: listToAttrs)
             (groupBy
               (cmd: cmd.value.category)