diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex
index 9a2b531..fcee52f 100644
--- a/Doc/lib/libstdtypes.tex
+++ b/Doc/lib/libstdtypes.tex
@@ -425,6 +425,7 @@
 \code{'strict'}, meaning that encoding errors raise a
 \exception{ValueError}.  Other possible values are \code{'ignore'} and
 \code{'replace'}.
+\versionadded{2.0}
 \end{methoddesc}
 
 \begin{methoddesc}[string]{endswith}{suffix\optional{, start\optional{, end}}}