diff --git a/lib/Dancer2/Core/Role/Logger.pm b/lib/Dancer2/Core/Role/Logger.pm
index 3b49a828d..b260f42ab 100644
--- a/lib/Dancer2/Core/Role/Logger.pm
+++ b/lib/Dancer2/Core/Role/Logger.pm
@@ -242,6 +242,10 @@ The possible values are:
 
 =over 4
 
+=item %a
+
+app name
+
 =item %h
 
 host emitting the request