diff --git a/FAQ.md b/FAQ.md
index 919c468..1995e1f 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -91,6 +91,10 @@ Usually the logs are collected during a long period of time span. Let's say each
     /logs/2015-01-03.log
     /logs/2015-01-04.log
 
+## gRPC Ports
+gRPC can be derived from the `-port` number and adding 10000 ontop of it. 
+`-port=8080` => gRPC Port: `18080`
+
 ## Mount Filer
 ### weed mount error after restarting