diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index 2420f66..95e66de 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -660,7 +660,7 @@
 this confusion does not arise.
 
 If the syntax \samp{**expression} appears in the function call,
-\samp{expression} must evaluate to a (subclass of) dictionary, the
+\samp{expression} must evaluate to a mapping, the
 contents of which are treated as additional keyword arguments.  In the
 case of a keyword appearing in both \samp{expression} and as an
 explicit keyword argument, a \exception{TypeError} exception is