Bug #1753406: missing \versionadded for subprocess.check_call.
 (backport from rev. 56364)
diff --git a/Doc/lib/libsubprocess.tex b/Doc/lib/libsubprocess.tex
index f639710..509f283 100644
--- a/Doc/lib/libsubprocess.tex
+++ b/Doc/lib/libsubprocess.tex
@@ -144,6 +144,8 @@
 \begin{verbatim}
     check_call(["ls", "-l"])
 \end{verbatim}
+
+\versionadded{2.5}
 \end{funcdesc}
 
 \subsubsection{Exceptions}