diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 00000000000..307e22b0df1
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,6 @@
+# format the world
+a06baa56b95674fc626b3c3fd680d6a65357fe60
+# format libcore
+95e00bfed801e264e9c4ac817004153ca0f19eb6
+# reformat with new rustfmt
+971c549ca334b7b7406e61e958efcca9c4152822