diff --git a/kernel/util/font.go b/kernel/util/font.go
index 0f443f030..132464be8 100644
--- a/kernel/util/font.go
+++ b/kernel/util/font.go
@@ -78,6 +78,7 @@ func getPreferredPDFWatermarkFont(userFontNames []string) (ret string) {
 			}
 		}
 	}
+	logging.LogInfof("preferred PDF font [%s]", ret)
 	return
 }