diff --git a/input/fsh/CommunicationRequest.fsh b/input/fsh/CommunicationRequest.fsh
index 4b7d5ae..a3fb2cf 100644
--- a/input/fsh/CommunicationRequest.fsh
+++ b/input/fsh/CommunicationRequest.fsh
@@ -25,7 +25,6 @@ Description: "A CommunicationRequest representing the advice or instruction give
 * insert ObligationRules(authoredOn) // not explicitly required/defined in dataset but important for context
 * insert ObligationRules(requester)
 * insert ObligationRules(sender)
-* insert ObligationRules(recipient)
 * insert ObligationRules(reasonCode) // already 1..1 so may not be needed place under obligation but added for consistency
 
 
diff --git a/input/fsh/Observation.fsh b/input/fsh/Observation.fsh
index 49abac6..7aa078f 100644
--- a/input/fsh/Observation.fsh
+++ b/input/fsh/Observation.fsh
@@ -130,7 +130,7 @@ Usage: #example
 
 Instance: ACP-PreferredPlaceOfDeath-Pat2
 InstanceOf: ACPPreferredPlaceOfDeath
-Title: "ACP Preferred Place Of Death - Pat 2"
+Title: "ACP Preferred Place of Death - Pat 2"
 Usage: #example
 * identifier.type = $v2-0203#RI "Resource identifier"
 * identifier.system = "https://acme.com/fhir/NamingSystem/resource-business-identifier"
@@ -270,7 +270,7 @@ Usage: #example
 
 Instance: ACP-OrganDonationChoiceRegistrationInDonorRegister-Pat2
 InstanceOf: ACPOrganDonationChoiceRegistration
-Title: "ACP Organ Donation Choice Registration In Donor Register - Pat 2"
+Title: "ACP Organ Donation Choice Registration in Donor Register - Pat 2"
 Usage: #example
 * identifier.type = $v2-0203#RI "Resource identifier"
 * identifier.system = "https://acme.com/fhir/NamingSystem/resource-business-identifier"
diff --git a/input/fsh/RuleSet.fsh b/input/fsh/RuleSet.fsh
index ecdbb5b..24f1231 100644
--- a/input/fsh/RuleSet.fsh
+++ b/input/fsh/RuleSet.fsh
@@ -48,6 +48,7 @@ RuleSet: CapabilityStatementSearchParmeterClinicalPatientExpectation
   * type = #reference
 
 RuleSet: ObligationRules(path)
+* {path} MS
 * {path} ^extension[$obligation][+].extension[code].valueCode = #SHALL:populate-if-known
 * {path} ^extension[$obligation][=].extension[actor].valueCanonical = Canonical(ACPActorProvider)
 * {path} ^extension[$obligation][+].extension[code].valueCode = #SHALL:no-error
diff --git a/input/pagecontent/data-model.md b/input/pagecontent/data-model.md
index fa16889..e84c036 100644
--- a/input/pagecontent/data-model.md
+++ b/input/pagecontent/data-model.md
@@ -23,14 +23,14 @@ The FHIR profiles in this guide are directly linked to the ACP dataset elements
 
 Each StructureDefinition includes a `StructureDefinition.mapping.uri` that points to the specific version of the ACP dataset used. Additionally, every element within a profile is individually mapped to its corresponding dataset element using the `ElementDefinition.mapping` property. The mapping table below shows all mappings in one view, while the "Mappings" tab of each profile page displays the mappings consolidated per profile. These mappings provide a straightforward way to highlight the elements that are especially relevant for the ACP use case. 
 
-#### Obligation flags
-To indicate which elements are essential for the ACP use case, <a href="https://hl7.org/fhir/extensions/StructureDefinition-obligation.html">Obligation flags</a> have been added to all elements mapped to the ACP dataset. These flags are visible in the formal profile views.
+#### MustSupport and Obligation flags
+To indicate which elements are essential for the ACP use case and for which implementations must thus provide support, `mustSupport` flags are placed on all elements mapped to the ACP dataset. For clarification of the expectations associated with these `mustSupport` labels, the <a href="https://hl7.org/fhir/extensions/StructureDefinition-obligation.html">`obligation` element</a> is used.
 
-In this version of the IG, Obligation flags are applied to all mapped elements, regardless of whether the dataset element is mandatory or optional. The obligations are defined for the following actors:
+In this version of the IG, `mustSupport` and `obligation` flags are applied to all mapped elements, regardless of whether the dataset element is mandatory or optional. The `obligations` are defined for the following actors:
 * <a href="ActorDefinition-ACPActorProvider.html">ACP Actor Provider</a>: `SHALL:populate-if-known`
 * <a href="ActorDefinition-ACPActorConsulter.html">ACP Actor Consulter</a>: `SHALL:no-error`
 
-In future versions of the IG, these obligations may be refined on a per-element basis.
+In future versions of the IG, these `obligations` may be refined on a per-element basis.
 
 #### Note on referenced zibs