diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 0000000000..5d87ade444
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# Upgrade to OCamlformat 0.26.0
+4c323310eb493392c60d33b5e1f45c6312b12853