diff --git a/webapi/src/main/scala/org/knora/webapi/slice/admin/domain/model/User.scala b/webapi/src/main/scala/org/knora/webapi/slice/admin/domain/model/User.scala
index e8aebec81a..8707ac06cd 100644
--- a/webapi/src/main/scala/org/knora/webapi/slice/admin/domain/model/User.scala
+++ b/webapi/src/main/scala/org/knora/webapi/slice/admin/domain/model/User.scala
@@ -188,7 +188,7 @@ object Username extends StringValueCompanion[Username] {
    */
   private val UsernameRegex: Regex = (
     "^(?=.{3,50}$)" +
-      // 4 - 50 characters long
+      // 3 - 50 characters long
       "(?![_.-])" +
       // Underscore, hyphen and dot can't be at the start of a username
       "(?!.*[_.-]{2})" +