diff --git a/man2/sigaction.2 b/man2/sigaction.2
index c108461cf..b516b0d9f 100644
--- a/man2/sigaction.2
+++ b/man2/sigaction.2
@@ -868,7 +868,7 @@ when the kernel provides it.
 .\"
 .SS Undocumented
 Before the introduction of
-.B SA_SIGINFO
+.BR SA_SIGINFO ,
 it was also possible to get some additional information,
 namely by using a
 .I sa_handler