diff --git a/pkg/ueps/packet.go b/pkg/ueps/packet.go
index 081f267..ab62654 100644
--- a/pkg/ueps/packet.go
+++ b/pkg/ueps/packet.go
@@ -12,6 +12,8 @@ import (
 // if err == errTLVValueTooLarge { /* value exceeded 255-byte TLV length limit */ }
 var errTLVValueTooLarge = sentinelError("TLV value too large for 1-byte length header")
 
+// var errNotFound = sentinelError("thing not found")
+// if err == errNotFound { /* exact sentinel identity preserved across returns */ }
 type sentinelError string
 
 func (sentinelErrorValue sentinelError) Error() string { return string(sentinelErrorValue) }