diff --git a/service/ziti-tunnel/service/pkg-vars.go b/service/ziti-tunnel/service/pkg-vars.go
index 3dc21f43..21a0ead9 100644
--- a/service/ziti-tunnel/service/pkg-vars.go
+++ b/service/ziti-tunnel/service/pkg-vars.go
@@ -75,6 +75,7 @@ const (
 	ShutdownEvent    = 0 //7
 	ErrorEvent       = 0 //1000
 
+	// power events microsoft docs https://docs.microsoft.com/en-us/windows/win32/cimwin32prov/win32-powermanagementevent?redirectedfrom=MSDN
 	PBT_APMSUSPEND = 4 // Entering Suspend
 	PBT_APMRESUMESUSPEND = 7 // Resume from Suspend
 	PBT_APMPOWERSTATUSCHANGE = 10 // Power Status Change