diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index d20f19e60e8..353bfcb6ac1 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -1,3 +1,5 @@
+# Use `git config blame.ignorerevsfile .git-blame-ignore-revs` to make `git blame` ignore the following commits.
+
 # format the world
 a06baa56b95674fc626b3c3fd680d6a65357fe60
 # format libcore