diff --git a/Doc/ref/ref4.tex b/Doc/ref/ref4.tex
index 00f3058..0eb6841 100644
--- a/Doc/ref/ref4.tex
+++ b/Doc/ref/ref4.tex
@@ -204,5 +204,6 @@
 interpreter.
 \end{notice}
 
-See also the description of the \keyword{try} statement in section
-\ref{try} and \keyword{raise} statement in section \ref{raise}.
+See also the description of the \keyword{try} statement in
+section~\ref{try} and \keyword{raise} statement in
+section~\ref{raise}.