diff --git a/doc/comment_action.md b/doc/comment_action.md
index 5e306e8..55d154b 100644
--- a/doc/comment_action.md
+++ b/doc/comment_action.md
@@ -7,7 +7,7 @@
 And in the case of some actions, `CONTENT` column value contains additional information.
 
 |ACTION          |CONTENT               |
-|-------------------|------------------------|
+|----------------|----------------------|
 |comment         |comment               |
 |close_comment   |comment               |
 |reopen_comment  |comment               |