diff --git a/js/actions/api-collection.js b/js/actions/api-collection.js
index 8e18b1f43e..24b456fadb 100644
--- a/js/actions/api-collection.js
+++ b/js/actions/api-collection.js
@@ -445,6 +445,8 @@ function get_api_collections (req, res) {
 ///   - 2: document collection (normal case)
 ///   - 3: edges collection
 ///
+/// - *isSystem*: If *true* then the collection is a system collection.
+///
 /// @RESTRETURNCODES
 ///
 /// @RESTRETURNCODE{404}