diff --git a/chart/README.md b/chart/README.md
index 26af79b..f54bd94 100644
--- a/chart/README.md
+++ b/chart/README.md
@@ -1,5 +1,7 @@
 # Rancher Longhorn Chart
 
+Please install Longhorn chart in `longhorn-system` namespace only.
+
 The following document pertains to running Longhorn from the Rancher 2.0 chart.
 
 ## Source Code