diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7d7a27a..b0b5f61 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -4,7 +4,7 @@
 
 Open a new issue from [issues](https://github.com/ueokande/vim-vixen/issues).
 **Ensure the issue was not already reported** by searching on GitHub under Issues.
-The issue should include title and clear description.
+The issue should include a title and clear description.
 
 Pull request is also welcome to send a patch from [Pull Requests](https://github.com/ueokande/vim-vixen/pulls).
 Ensure the pull request includes description, and passes tests in CI.