diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index 65a3cff..1f2dc5e 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -1039,7 +1039,7 @@
 The expression \code{\var{x} if \var{C} else \var{y}} first evaluates
 \var{C} (\emph{not} \var{x}); if \var{C} is true, \var{x} is evaluated and
 its value is returned; otherwise, \var{y} is evaluated and its value is
-returned.
+returned.  \versionadded{2.5}
 
 The expression \code{\var{x} and \var{y}} first evaluates \var{x}; if
 \var{x} is false, its value is returned; otherwise, \var{y} is