diff -r 6f4e0c462daf Lib/ast.py
--- a/Lib/ast.py	Wed Jul 22 14:49:13 2015 +0300
+++ b/Lib/ast.py	Thu Jul 23 01:13:32 2015 +0300
@@ -194,7 +194,7 @@
     be found.  If the node provided does not have docstrings a TypeError
     will be raised.
     """
-    if not isinstance(node, (FunctionDef, ClassDef, Module)):
+    if not isinstance(node, (AsyncFunctionDef, FunctionDef, ClassDef, Module)):
         raise TypeError("%r can't have docstrings" % node.__class__.__name__)
     if node.body and isinstance(node.body[0], Expr) and \
        isinstance(node.body[0].value, Str):
diff -r 6f4e0c462daf Lib/test/test_ast.py
--- a/Lib/test/test_ast.py	Wed Jul 22 14:49:13 2015 +0300
+++ b/Lib/test/test_ast.py	Thu Jul 23 01:13:32 2015 +0300
@@ -511,6 +511,9 @@
         self.assertEqual(ast.get_docstring(node.body[0]),
                          'line one\nline two')
 
+        node = ast.parse('async def foo():\n  """spam\n  ham"""')
+        self.assertEqual(ast.get_docstring(node.body[0]), 'spam\nham')
+
     def test_literal_eval(self):
         self.assertEqual(ast.literal_eval('[1, 2, 3]'), [1, 2, 3])
         self.assertEqual(ast.literal_eval('{"foo": 42}'), {"foo": 42})