diff --git a/docs/random/testing/syntax b/docs/random/testing/syntax
index 404db220de..72704c5c10 100644
--- a/docs/random/testing/syntax
+++ b/docs/random/testing/syntax
@@ -20,6 +20,7 @@ tcP: pipeline of the testcase in gst_parse_launch () syntax.
 tcS: id1, element, signalname (attach to signal in an element)
 tcS: id2, element, signalname
 ...
+tcI: the number of iterations on the top bin 
 tcR: id1,1,id2,1,.. (the pattern of signals trigered)
 or 
 tcR: id1==id2,... (denote an equal number of signals)
@@ -31,3 +32,5 @@ signal trigger patterns
 
 
 
+
+