diff --git a/timer/Readme.md b/timer/Readme.md
index 84afd116b..3f35b55be 100644
--- a/timer/Readme.md
+++ b/timer/Readme.md
@@ -29,4 +29,6 @@ OR
 	var intervalId = timer.setInterval(function(){ log("Test"); }, 2000);
 	...
 	timer.clearInterval(intervalId)
-```
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+```
+
+The second parameter for setTimeout and setInterval is optional with default value of 0.
\ No newline at end of file