diff --git a/bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/tempusdominus/TempusDominusLocalizationConfig.java b/bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/tempusdominus/TempusDominusLocalizationConfig.java
index ea2fba6c9..e85f3c244 100644
--- a/bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/tempusdominus/TempusDominusLocalizationConfig.java
+++ b/bootstrap-extensions/src/main/java/de/agilecoders/wicket/extensions/markup/html/bootstrap/form/tempusdominus/TempusDominusLocalizationConfig.java
@@ -450,6 +450,7 @@ private static String toJavaScriptDateFormat(final String _fmt) {
         String jsFormat = nullToEmpty(_fmt).replace(" a", " t");
         Matcher yearMatcher = YEAR_PATTERN.matcher(jsFormat);
         if (yearMatcher.find()) {
+            // this code is required while https://github.com/Eonasdan/tempus-dominus/issues/2855 is not fixed :(
             String year = yearMatcher.group(1);
             // only 2 or 4 'yyyy' are supported
             if (year.length() < 2 || year.length() > 2) {