diff --git a/requests_html.py b/requests_html.py
index f1ef240..7461f2d 100644
--- a/requests_html.py
+++ b/requests_html.py
@@ -237,6 +237,9 @@ class HTML(BaseParser):
         If ``scrolldown`` is specified, the page will scrolldown the specified
         number of times, after sleeping the specified amount of time.
 
+        If just ``sleep`` is provided, the rendering will wait *n* seconds, before
+        returning.
+
         If ``script`` is specified, it will execute the provided JavaScript at
         runtime. Example: