diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 0000000..8fec793
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,3 @@
+# .git-blame-ignore-revs
+# format code.
+6501efe88bdae828ff7c6149b6dc368b9656f72c