diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index 4dda4744f..709f3b0db 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -510,6 +510,12 @@ vhost rtc.vhost.srs.com {
         # default: on
         enabled on;
     }
+    # For TWCC.
+    twcc {
+        # Whether support TWCC.
+        # default: on
+        enabled on;
+    }
 }
 
 #############################################################################################