diff --git a/src/main/resources/messages.properties b/src/main/resources/messages.properties
index 4b4127d7..2133c5d4 100644
--- a/src/main/resources/messages.properties
+++ b/src/main/resources/messages.properties
@@ -102,7 +102,7 @@ sebserver.form.validation.fieldError.serverNotAvailable=No service seems to be a
 sebserver.form.validation.fieldError.url.invalid=Invalid URL. The given URL cannot be reached.
 sebserver.form.validation.fieldError.url.noservice=The expected service is not available within the given URL and API access.
 sebserver.form.validation.fieldError.thresholdDuplicate=There are duplicate threshold values.
-sebserver.form.validation.fieldError.thresholdEmpty=There are empty threshold entries.
+sebserver.form.validation.fieldError.thresholdEmpty=There are missing values or colors for the threshold declaration
 sebserver.error.unexpected=Unexpected Error
 sebserver.page.message=Information
 sebserver.dialog.confirm.title=Confirmation