diff --git a/Resources/input/fsh/ISiKPatient.fsh b/Resources/input/fsh/ISiKPatient.fsh
index cc05ef8d..3de2e986 100644
--- a/Resources/input/fsh/ISiKPatient.fsh
+++ b/Resources/input/fsh/ISiKPatient.fsh
@@ -214,11 +214,15 @@ Hinweise zu Inkompatibilitäten können über die [Portalseite](https://service.
   * extension contains $data-absent-reason named Data-Absent-Reason 0..1 MS
   * extension[Data-Absent-Reason].value[x] = #unknown (exactly)
   * extension[Data-Absent-Reason].value[x] MS
+  * ^short = "Geburstdatum"
+  * ^comment = "Tages-, monats- oder jahresgenaues Geburtsdatum.  
+    **Begründung Pflichtfeld:** Das Geburstdatum dient - in Verbindung mit dem Namen - als wichtiges Such- und Unterscheidungskriterium.  
+    **Weitere Hinweise:** siehe [Deutsche Basisprofile](https://simplifier.net/guide/leitfaden-de-basis-r4/ig-markdown-Ressourcen-Patient?version=current#ig-markdown-Ressourcen-Patient-Geburtsdatum)"
 * address MS
   * ^slicing.discriminator.type = #pattern
   * ^slicing.discriminator.path = "$this"
   * ^slicing.rules = #open
-  * ^comment = "In order to differentiate between post box addresses and physical addresses, street names and house numbers, and to add city district names, vendors can opt to support the extensions as suggested in the German Address Base Profile http://fhir.de/StructureDefinition/address-de-basis.\r\nSuch differentiations are however not required within the scope of this specification."
+  //* ^comment = "In order to differentiate between post box addresses and physical addresses, street names and house numbers, and to add city district names, vendors can opt to support the extensions as suggested in the German Address Base Profile http://fhir.de/StructureDefinition/address-de-basis.\r\nSuch differentiations are however not required within the scope of this specification."
 * address contains
     Strassenanschrift 0..* MS and
     Postfach 0..* MS