diff --git a/doc/ggsn.8 b/doc/ggsn.8
index 3b9e903..62d467a 100644
--- a/doc/ggsn.8
+++ b/doc/ggsn.8
@@ -189,7 +189,7 @@
 .TP
 .BI --timelimit " seconds"
 Exit 
-.b ggsn
+.B ggsn
 after \fIseconds\fP. Used for debugging.