diff --git a/doc/bgpd.texi b/doc/bgpd.texi
index 5004cbf..7d92b5e 100644
--- a/doc/bgpd.texi
+++ b/doc/bgpd.texi
@@ -496,7 +496,11 @@
 @end deffn
 
 @deffn {Route Map} {set as-path prepend @var{as-path}} {}
-@deffnx {Route Map} {set as-path prepend last-as @var{num}} {}
+Prepend the given string of AS numbers to the AS_PATH.
+@end deffn
+
+@deffn {Route Map} {set as-path prepend last-as @var{num}} {}
+Prepend the existing last AS number (the leftmost ASN) to the AS_PATH.
 @end deffn
 
 @node Private AS Numbers