diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index e69de29bb2..57cba171fb 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# Applied 120 line-length rule to all files: https://github.com/modelcontextprotocol/python-sdk/pull/856
+543961968c0634e93d919d509cce23a1d6a56c21