diff --git a/Lib/compiler/pycodegen.py b/Lib/compiler/pycodegen.py
index 51ab9bdad7c..4f8d8247ce7 100644
--- a/Lib/compiler/pycodegen.py
+++ b/Lib/compiler/pycodegen.py
@@ -121,7 +121,12 @@ class ASTVisitor:
             return meth(node)
 
 class ExampleASTVisitor(ASTVisitor):
-    """Prints examples of the nodes that aren't visited"""
+    """Prints examples of the nodes that aren't visited
+
+    This visitor-driver is only useful for development, when it's
+    helpful to develop a visitor incremently, and get feedback on what
+    you still have to do.
+    """
     examples = {}
     
     def dispatch(self, node):
diff --git a/Tools/compiler/compiler/pycodegen.py b/Tools/compiler/compiler/pycodegen.py
index 51ab9bdad7c..4f8d8247ce7 100644
--- a/Tools/compiler/compiler/pycodegen.py
+++ b/Tools/compiler/compiler/pycodegen.py
@@ -121,7 +121,12 @@ class ASTVisitor:
             return meth(node)
 
 class ExampleASTVisitor(ASTVisitor):
-    """Prints examples of the nodes that aren't visited"""
+    """Prints examples of the nodes that aren't visited
+
+    This visitor-driver is only useful for development, when it's
+    helpful to develop a visitor incremently, and get feedback on what
+    you still have to do.
+    """
     examples = {}
     
     def dispatch(self, node):