added ref to vars()
diff --git a/Doc/ref/ref6.tex b/Doc/ref/ref6.tex
index f0f318f..afd9822 100644
--- a/Doc/ref/ref6.tex
+++ b/Doc/ref/ref6.tex
@@ -524,6 +524,7 @@
must be dictionaries and they are used for the global and local
variables, respectively.
-Note: dynamic evaluation of expressions is supported by the built-in
-function \verb@eval@.
-
+Hints: dynamic evaluation of expressions is supported by the built-in
+function \verb@eval()@. The built-in function \verb@vars()@ returns
+the current local dictionary, which may be useful to pass around for
+use by \verb@exec@.