diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 59cc204e..cad0b333 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -3,3 +3,7 @@ Thank you for the PR! Contributors like you keep React awesome!
 Please see the Contribution Guide for guidelines:
 
 https://github.com/reactjs/reactjs.org/blob/master/CONTRIBUTING.md
+
+If your PR references an existing ssue, please add the issue number below:
+
+#<Issue>