diff --git a/docs/user/site.rst b/docs/user/site.rst
index 90b70bdd09568d5f3d72603d756c53844113cfca..2c4c6e8bcb701a83088ded3ae32047c83ccd8a59 100644
--- a/docs/user/site.rst
+++ b/docs/user/site.rst
@@ -159,7 +159,7 @@ roles : optional
       },
 
 simple_tc : package
-    Uplink traffic control
+    Uplink traffic control, ingress and egress values are specified in kbit/s.
     ::
 
       simple_tc = {