diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index 08013460..c03d829a 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -1,3 +1,5 @@
 # Apply black to whole codebase
-# https://github.com/PyGithub/PyGithub/pull/1303
-6ceb9e9a15dd82942698c4f891627303de05c91e
\ No newline at end of file
+6ceb9e9a15dd82942698c4f891627303de05c91e
+
+# Fix isort - add known first and third party
+540a0850017e836f13a8c566abfdf7f6a952ffe3
\ No newline at end of file