diff --git a/mir-module/src/main/resources/META-INF/resources/authorization/new-author-includes.xed b/mir-module/src/main/resources/META-INF/resources/authorization/new-author-includes.xed
index dbcc35a9a2..4dfc932f55 100644
--- a/mir-module/src/main/resources/META-INF/resources/authorization/new-author-includes.xed
+++ b/mir-module/src/main/resources/META-INF/resources/authorization/new-author-includes.xed
@@ -7,7 +7,7 @@
 
   <xed:template id="userAccount">
     <mcruser:template name="textInput" xpath="@name" id="userName" i18n="component.user2.admin.userAccount" i18n.error="component.user2.admin.inputhints.username"
-      required="true" matches="[a-z0-9\._-]*" maxlength="16" />
+      required="true" matches="[a-z0-9\._-]*" maxlength="16" placeholder="mir.register.username.placeholder"/>
     <xed:bind xpath="@realm" set="local" />
   </xed:template>
 
@@ -45,4 +45,4 @@
       <xed:cleanup-rule xpath="//attribute[@name='recaptchaParam']" relevant-if="true" />
     </xed:if>
   </xed:template>
-</xed:template>
\ No newline at end of file
+</xed:template>
diff --git a/mir-module/src/main/resources/config/mir/messages_de.properties b/mir-module/src/main/resources/config/mir/messages_de.properties
index 2944979edb..b3b5d1b88c 100644
--- a/mir-module/src/main/resources/config/mir/messages_de.properties
+++ b/mir-module/src/main/resources/config/mir/messages_de.properties
@@ -605,6 +605,7 @@ mir.publisher.station                           = Sender:
 mir.publisherOrganization                       = Herausgebende Einrichtung
 mir.register.email                              = your.mail@address.de
 mir.register.realName                           = Vorname Nachname
+mir.register.username.placeholder               = maximal 16 Zeichen, erlaubte Zeichen sind a-z, 0-9 sowie ._-
 mir.relatedItem                                 = Verbundene Quelle
 mir.relatedItem.alreadyLinked                   = Das ausgew\u00E4hlte Dokument wurde bereits mit diesem Dokument verkn\u00FCpft.
 mir.relatedItem.doesNotExist                    = Referenz kann nicht angezeigt werden oder wurde gel\u00F6scht
diff --git a/mir-module/src/main/resources/config/mir/messages_en.properties b/mir-module/src/main/resources/config/mir/messages_en.properties
index 25d9b053e1..f4c131f7d5 100644
--- a/mir-module/src/main/resources/config/mir/messages_en.properties
+++ b/mir-module/src/main/resources/config/mir/messages_en.properties
@@ -580,6 +580,7 @@ mir.publisher.station                          = Broadcasting Station:
 mir.publisherOrganization                      = Publishing organization
 mir.register.email                             = your.mail@address.com
 mir.register.realName                          = First name Surname
+mir.register.username.placeholder              = maximum of 16 characters, allowed characters are a-z, 0-9 and ._-
 mir.relatedItem                                = Related item
 mir.relatedItem.alreadyLinked                  = The currently selected document is already linked to this document.
 mir.relatedItem.doesNotExist                   = Reference can not be displayed or was deleted