diff --git a/doc/wiki.txt b/doc/wiki.txt
index 1bcb897d..790bc4f0 100644
--- a/doc/wiki.txt
+++ b/doc/wiki.txt
@@ -579,7 +579,8 @@ the commands are also available as mappings of the form `<plug>(wiki-[name])`.
 *WikiGraphCheckLinks*
   Check the wiki for broken links. If any broken links are found, they are
   added to the location list (|location-list|) and the location list is
-  opened.
+  opened. The process of checking for broken links can take a while if you
+  have a large wiki.
 
 *<plug>(wiki-graph-in)*
 *<plug>(wiki-graph-out)*