diff --git a/doc/DOCUMENTATION.md b/doc/DOCUMENTATION.md
index 4f5be858f..26cd57c43 100644
--- a/doc/DOCUMENTATION.md
+++ b/doc/DOCUMENTATION.md
@@ -617,6 +617,9 @@ No doubt that `Evil` is one of the most advanced `Vim` emulation and you should
 not see big difference between `Vim` and `Emacs`. I did not find any command I
 used in Vim that I missed in Emacs with `Evil`.
 
+The `,` key does "repeat last `f`, `t`, `F`, or `T` command in opposite direction"
+in `Vim`, but not in `Spacemacs`.
+
 Send a PR to add the differences you found in this section.
 
 ## The vim-surround case