diff --git a/releasenotes-builder/config/checkstyle.properties b/releasenotes-builder/config/checkstyle.properties
index 4b1a8c040..b1acc8e0d 100644
--- a/releasenotes-builder/config/checkstyle.properties
+++ b/releasenotes-builder/config/checkstyle.properties
@@ -1,3 +1,5 @@
+# suppress inspection "UnusedProperty" for whole file
+# properties are used at "misc/build.xml"
 checkstyle.suppressions.file=config/suppressions.xml
 checkstyle.header.file=https://raw.githubusercontent.com/checkstyle/checkstyle/master/config/java.header
 checkstyle.regexp.header.file=https://raw.githubusercontent.com/checkstyle/checkstyle/master/config/java_regexp.header