diff --git a/interfaces/lock.go b/interfaces/lock.go
index b14854f..e8a740d 100644
--- a/interfaces/lock.go
+++ b/interfaces/lock.go
@@ -6,6 +6,9 @@ import (
 	"github.com/zclconf/go-cty/cty"
 )
 
+// LockTypeString is the type constraint string for lock interface.
+// When updating the type constraint string, make sure to also update the two
+// private endpoint interfaces (the one with subresource and the one without).
 var LockTypeString = `object({
 	kind = string
 	name = optional(string, null)
diff --git a/interfaces/private_endpoints.go b/interfaces/private_endpoints.go
index 0ccbd55..10d3e97 100644
--- a/interfaces/private_endpoints.go
+++ b/interfaces/private_endpoints.go
@@ -15,6 +15,7 @@ var PrivateEndpointTypeString = `map(object({
     condition                              = optional(string, null)
     condition_version                      = optional(string, null)
     delegated_managed_identity_resource_id = optional(string, null)
+    principal_type         							   = optional(string, null)
   })), {})
   lock               = optional(object({
     kind = string
diff --git a/interfaces/private_endpoints_with_subresource_name.go b/interfaces/private_endpoints_with_subresource_name.go
index 327b084..3314ea8 100644
--- a/interfaces/private_endpoints_with_subresource_name.go
+++ b/interfaces/private_endpoints_with_subresource_name.go
@@ -15,6 +15,7 @@ var PrivateEndpointWithSubresourceNameTypeString = `map(object({
     condition                              = optional(string, null)
     condition_version                      = optional(string, null)
     delegated_managed_identity_resource_id = optional(string, null)
+    principal_type         							   = optional(string, null)
   })), {})
   lock               = optional(object({
     kind = string
diff --git a/interfaces/role_assignments.go b/interfaces/role_assignments.go
index 123812d..a16472f 100644
--- a/interfaces/role_assignments.go
+++ b/interfaces/role_assignments.go
@@ -5,6 +5,9 @@ import (
 	"github.com/zclconf/go-cty/cty"
 )
 
+// RoleAssignmentsTypeString is the type constraint string for role assignments.
+// When updating the type constraint string, make sure to also update the two
+// private endpoint interfaces (the one with subresource and the one without).
 var RoleAssignmentsTypeString = `map(object({
   role_definition_id_or_name             = string
   principal_id                           = string
@@ -13,6 +16,7 @@ var RoleAssignmentsTypeString = `map(object({
   condition                              = optional(string, null)
   condition_version                      = optional(string, null)
   delegated_managed_identity_resource_id = optional(string, null)
+	principal_type         							   = optional(string, null)
 }))`
 
 var roleAssignmentsType = StringToTypeConstraintWithDefaults(RoleAssignmentsTypeString)
diff --git a/interfaces/tags.go b/interfaces/tags.go
index e7ecf12..78bea9e 100644
--- a/interfaces/tags.go
+++ b/interfaces/tags.go
@@ -5,6 +5,9 @@ import (
 	"github.com/zclconf/go-cty/cty"
 )
 
+// TagsTypeString is the type constraint string for tags.
+// When updating the type constraint string, make sure to also update the two
+// private endpoint interfaces (the one with subresource and the one without).
 var TagsTypeString = `map(string)`
 
 var tagsType = StringToTypeConstraintWithDefaults(TagsTypeString)