diff --git a/pkgs/gui-pkgs/gui-lib/framework/main.rkt b/pkgs/gui-pkgs/gui-lib/framework/main.rkt
index a2902760e5..43a285a57e 100644
--- a/pkgs/gui-pkgs/gui-lib/framework/main.rkt
+++ b/pkgs/gui-pkgs/gui-lib/framework/main.rkt
@@ -1480,7 +1480,7 @@
 
  (proc-doc/names
   racket:get-color-prefs-table
-  (-> (listof (list/c symbol? (is-a?/c color%))))
+  (-> (listof (list/c symbol? (is-a?/c color%) string?)))
   ()
   @{Returns a table mapping from symbols (naming the categories that the online
     colorer uses for Racket mode coloring) to their colors.
@@ -1493,7 +1493,7 @@
 
  (proc-doc/names
   racket:get-white-on-black-color-prefs-table
-  (-> (listof (list/c symbol? (is-a?/c color%))))
+  (-> (listof (list/c symbol? (is-a?/c color%) string?)))
   ()
   @{Returns a table mapping from symbols (naming the categories that the online
     colorer uses for Racket mode coloring) to their colors when the user