diff --git a/plugins/mod_pep.lua b/plugins/mod_pep.lua
index 067d87ec2..4986f714a 100644
--- a/plugins/mod_pep.lua
+++ b/plugins/mod_pep.lua
@@ -22,6 +22,8 @@ local services = {};
 
 -- username -> recipient -> set of nodes
 local recipients = {};
+
+-- caps hash -> set of nodes
 local hash_map = {};
 
 local host = module.host;