diff --git a/Doc/lib/libtraceback.tex b/Doc/lib/libtraceback.tex
index eee898e14fc..1ad165c0181 100644
--- a/Doc/lib/libtraceback.tex
+++ b/Doc/lib/libtraceback.tex
@@ -51,6 +51,7 @@ variables.)
 \begin{funcdesc}{format_exc}{\optional{limit\optional{, file}}}
 This is like \code{print_exc(\var{limit})} but returns a string
 instead of printing to a file.
+\versionadded{2.4}
 \end{funcdesc}
 
 \begin{funcdesc}{print_last}{\optional{limit\optional{, file}}}