diff --git a/etc/git-extras-completion.zsh b/etc/git-extras-completion.zsh
index 6a078f2..7e91c3b 100644
--- a/etc/git-extras-completion.zsh
+++ b/etc/git-extras-completion.zsh
@@ -400,6 +400,7 @@ _git-refactor() {
 
 
 _git-squash() {
+    _arguments '--squash-msg[commit with the squashed commit messages]'
     _arguments \
         ':branch-name:__gitex_branch_names'
 }