diff --git a/README.md b/README.md
index 7aa9ace..8ffd2b7 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Just copy the files into your php capable webserver directory. Be sure, that the
 
 ## Usage
 
-Just call the url. You can filter by categories by adding /?filter=category to the request. You can expand the interval of the events by adding /?interval=<int> to the request. The number represents the amount of future months as an integer between 1..12.
+Just call the url. You can filter by categories by adding /?filter=category to the request. You can expand the period of the events by adding /?period=<int> to the request. The number represents the amount of future months as an integer between 1..12.
 
 ## Example integration using jQuery.