diff --git a/README b/README
index b3660f3..bdd1ac4 100644
--- a/README
+++ b/README
@@ -47,7 +47,14 @@ vicious.register() to register it with Vicious:
         graph or a progressbar)
 
     wtype
-      - one of the available widget types, see below for a list
+      - widget type or a function
+        - any of the available (default, or custom) widget types can
+          be used here, see below for a list of those provided by
+          Vicious
+      - function
+        - custom functions from your own "awesome" configuration can
+          be registered as widget types, see the "Custom widget types"
+          section
 
     format
       - string argument or a function