diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 000000000..16761a1db
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# Replace Black with Ruff, then format whole project.
+44a44e938fb2bd0bb085d8aa4577abeb01653ad3