diff --git a/README.md b/README.md
index 2ff08c6..2bf1dbd 100644
--- a/README.md
+++ b/README.md
@@ -168,7 +168,7 @@ Denylist entries block any requests from that source. The entries below may furt
 ### Google crap
 
 	device-provisioning.googleapis.com
-	firebaseinstallations.googleapis.com
+	firebaseinstallations.googleapis.com* (may cause breakage)
 	firebaselogging-pa.googleapis.com
 	googletagmanager.com