diff --git a/doc/reference.rst b/doc/reference.rst
index a39faa20b1a7a5141fe695dc6707b1c4a2ba7ebe..03461ab02fff7353151d7d1c9586eac2704deee2 100644
--- a/doc/reference.rst
+++ b/doc/reference.rst
@@ -411,15 +411,27 @@ Abstract Syntax Trees
 
 .. versionadded:: 2014.1
 
+AST Expression
+--------------
+
 .. autoclass:: AstExpr
     :members:
 
+AST Node
+--------
+
 .. autoclass:: AstNode
     :members:
 
+AST Build
+---------
+
 .. autoclass:: AstBuild
     :members:
 
+AST Print Options
+-----------------
+
 .. autoclass:: AstPrintOptions
     :members: