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-rw-r--r--CONTRIBUTING.md6
1 files changed, 6 insertions, 0 deletions
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4daaa986a2d..d796dc18032 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -129,6 +129,12 @@ the master branch to your feature branch.
 Also, please make sure that fixup commits are squashed into other related
 commits with meaningful commit messages.
 
+GitHub allows [closing issues using keywords][closing-keywords]. This features
+should be used to keep the issue tracker tidy. But in pull requests only. Please
+do not add this to your commit message.
+
+[closing-keywords]: https://help.github.com/en/articles/closing-issues-using-keywords
+
 Please make sure your pull request is in compliance with Rust's style
 guidelines by running