diff --git a/bundles/telegraf/metadata.py b/bundles/telegraf/metadata.py
index 8f73caf..18bcb2f 100644
--- a/bundles/telegraf/metadata.py
+++ b/bundles/telegraf/metadata.py
@@ -7,7 +7,7 @@ defaults = {
             # needed by crystal plugins:
             'libgc-dev': {},
             'libevent-dev': {},
-            # crystal based:
+            # crystal based (procio, pressure_stall):
             'libpcre3': {},
         },
         'sources': {