diff --git a/docs/manpages/nlsrc.rst b/docs/manpages/nlsrc.rst
index 7b566b4..d93280d 100644
--- a/docs/manpages/nlsrc.rst
+++ b/docs/manpages/nlsrc.rst
@@ -84,6 +84,9 @@
 
   ndnsec set-default /ndn/a-site/%C1.Operator/op
 
+Support for adding prefix costs is currently only implemented via readvertisement;
+this functionality will be added in a future release.
+
 Exit Status
 -----------