diff --git a/README.md b/README.md
index ba33aae..57b7153 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@ The default renderer only displays the item as the text. The API for custom rend
 
 ```python3
 class Whatever(triditko.Renderer):
-    def render(itemname: str) -> pygame.Surface: ...
+    def render(itemname: str, w: int, h: int) -> pygame.Surface: ...
 ```
 
 The renderer is passed as the fully qualified class name (i.e. if that code is
-in file `renderers.py`, pass `renderers.Whatever`)
+in file `renderers.py`, pass `renderers:Whatever`)