diff --git a/infrared_plugin/plugin.spec b/infrared_plugin/plugin.spec
index 42568b30..5b47e3ac 100644
--- a/infrared_plugin/plugin.spec
+++ b/infrared_plugin/plugin.spec
@@ -223,3 +223,7 @@ subparsers:
                       help: |
                           Enable usage of specified mirror (for rpm, pip etc) [brq,qeos,tlv - or hostname].
                           (Specified mirror needs to proxy multiple rpm source hosts and pypi packages.)
+                  build:
+                      help: |
+                          String represents a timestamp of the OSP puddle.
+                      type: Value