fix a versionchanged tag
diff --git a/Doc/lib/libcfgparser.tex b/Doc/lib/libcfgparser.tex
index b0680d2..53170fa 100644
--- a/Doc/lib/libcfgparser.tex
+++ b/Doc/lib/libcfgparser.tex
@@ -61,7 +61,7 @@
of sections, for the options within a section, and for the default values.
This class does not support the magical interpolation behavior.
\versionadded{2.3}
-\versionchanged{\var{dict_type} was added}[2.6]
+\versionchanged[\var{dict_type} was added]{2.6}
\end{classdesc}
\begin{classdesc}{ConfigParser}{\optional{defaults}}