diff --git a/pytools/__init__.py b/pytools/__init__.py
index 585d4b8d50fa188e28ffedfbb8285ec3f08bebb0..b7dc0989835991c6c29392894b48743a942b05ee 100644
--- a/pytools/__init__.py
+++ b/pytools/__init__.py
@@ -153,6 +153,17 @@ Sorting in natural order
 
 .. autofunction:: natorder
 .. autofunction:: natsorted
+
+Type Variables Used
+-------------------
+
+.. class:: T
+
+    Any type.
+
+.. class:: F
+
+    Any callable.
 """
 
 # {{{ type variables