1 files changed, 1 insertions, 1 deletions
diff --git a/save.go b/save.go
index 37a457e..78175bd 100644
--- a/save.go
+++ b/save.go
@@ -35,7 +35,7 @@ func SavePB(pb proto.Message, fullname string) error {
 	if strings.HasSuffix(fullname, ".json") {
 		return saveJSON(pb)
 	}
-	return fmt.Errorf("unknown filetype %s", fullname)
+	return fmt.Errorf("unknown filetype '%s'", fullname)
 }
 
 func saveProto(pb proto.Message, fullname string) error {