diff --git a/readControlFile.go b/readControlFile.go
index 2dc214c..ea32da9 100644
--- a/readControlFile.go
+++ b/readControlFile.go
@@ -92,6 +92,7 @@ func (c *controlBox) readControlFile() error {
 
 			}
 		default:
+			log.Warn("the 'control' file has a value I don't know about")
 			log.Warn("error unknown key", key, "value:", value)
 		}
 	}