diff --git a/README.md b/README.md
index f9a4a5c..ae08365 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Next you should register this library in Jenkins -> System settings -> Global Pi
 `org.SHS.Platforms` Class:
  * `get()` - download and parse `platforms.json` file from `PLATFORMS_GIT`
  * `root()` - returns root JSON object of `platforms.json`
- * `forEach(func, ...)` - iterate over platforms, optional parameters:
+ * `forEach(func, ...)` - iterate over platforms, `func` is only mandatory parameter:
    * `func` - method to execute for each enabled platform, pass JSON element of current platform
    * `stagePrefix` - prefix string for `stage`
    * `stageSuffix` - sufffix string for `stage`