Change reference to execframes to naming.
diff --git a/Doc/ref/ref7.tex b/Doc/ref/ref7.tex
index 3cad6f2..265c0b8 100644
--- a/Doc/ref/ref7.tex
+++ b/Doc/ref/ref7.tex
@@ -416,7 +416,7 @@
A class definition is an executable statement. It first evaluates the
inheritance list, if present. Each item in the inheritance list
should evaluate to a class object. The class's suite is then executed
-in a new execution frame (see section \ref{execframes}), using a newly
+in a new execution frame (see section \ref{naming}), using a newly
created local namespace and the original global namespace.
(Usually, the suite contains only function definitions.) When the
class's suite finishes execution, its execution frame is discarded but