diff --git a/documentation/system-integration-testing.md b/documentation/system-integration-testing.md
index 3cbbaac..273d884 100644
--- a/documentation/system-integration-testing.md
+++ b/documentation/system-integration-testing.md
@@ -27,4 +27,7 @@ Eventually it would be nice to automate this, but I've found a front end is diff
 * Test recovery once URL is back
 
 ## Settings Test
-* Verify version comes across once released
\ No newline at end of file
+* Verify version comes across once released
+
+## Docker Test
+* Verify setting a custom PORT environment variable does not break the image