diff --git a/Hadoop-Compatible-File-System.md b/Hadoop-Compatible-File-System.md
index ae4219f..553422e 100644
--- a/Hadoop-Compatible-File-System.md
+++ b/Hadoop-Compatible-File-System.md
@@ -163,3 +163,4 @@ One of the headache with complicated Java systems is the jar runtime dependency
 
 ## Note
 * use `-Djava.net.preferIPv4Stack=true` if possible, see https://github.com/netty/netty/issues/6454
+* See [[Security-Configuration#for-java-grpc]] if you enabled gRpc security.
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