diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..5aad1c2
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,3 @@
+<!--
+REMINDER: Please target the **oldest** branch of PHPCSDevTools that is affected by this issue.
+-->