diff --git a/informers/factory.go b/informers/factory.go
index f2fef0e0..86c24551 100644
--- a/informers/factory.go
+++ b/informers/factory.go
@@ -247,6 +247,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new