diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 000000000..7b065e422
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,3 @@
+# Prettier auto-commit runs with GITHUB_TOKEN (GitHub App).
+# GitHub blocks that token from creating/updating anything under .github/workflows.
+.github/workflows/**