diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleAssignmentsCalls.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleAssignmentsCalls.json
index 99a48ce7ba40..327f66b83e0e 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleAssignmentsCalls.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleAssignmentsCalls.json
@@ -492,24 +492,44 @@
 			"description": "Role Assignments filter"
 		},
 		"RoleAssignmentPropertiesWithScope": {
-			"properties": {
-				"scope": {
-					"type": "string",
-					"description": "The role assignment scope."
-				},
-				"roleDefinitionId": {
-					"type": "string",
-					"description": "The role definition ID."
-				},
-				"principalId": {
-					"type": "string",
-					"description": "The principal ID."
-				},
-				"canDelegate": {
-					"type": "boolean",
-					"description": "The Delegation flag for the roleassignment"
-				}
-			},
+      "properties": {
+        "scope": {
+          "type": "string",
+          "description": "The role assignment scope."
+        },
+        "roleDefinitionId": {
+          "type": "string",
+          "description": "The role definition ID."
+        },
+        "principalId": {
+          "type": "string",
+          "description": "The principal ID."
+        },
+        "principalType": {
+          "type": "string",
+          "description": "The principal type of the assigned principal ID.",
+          "enum": [
+            "User",
+            "Group",
+            "ServicePrincipal",
+            "Unknown",
+            "DirectoryRoleTemplate",
+            "ForeignGroup",
+            "Application",
+            "MSI",
+            "DirectoryObjectOrGroup",
+            "Everyone"
+          ],
+          "x-ms-enum": {
+            "name": "PrincipalType",
+            "modelAsString": true
+          }
+        },
+        "canDelegate": {
+          "type": "boolean",
+          "description": "The Delegation flag for the roleassignment"
+        }
+      },
 			"description": "Role assignment properties with scope."
 		},
 		"RoleAssignment": {
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentById.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentById.json
index 8728e7aa38b7..db2fb17446e7 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentById.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentById.json
@@ -10,6 +10,7 @@
         "properties": {
           "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
           "principalId": "Pid",
+          "principalType": "Ptype",
           "scope": "/subscriptions/subId/resourcegroups/rgname",
           "canDelegate":false
         },
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentByName.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentByName.json
index ceee8a6e3216..d55443329e02 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentByName.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/DeleteRoleAssignmentByName.json
@@ -10,8 +10,9 @@
         "properties": {
           "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
           "principalId": "Pid",
+          "principalType": "Ptype",
           "scope": "/subscriptions/subId/resourcegroups/rgname",
-          "canDelegate":false
+          "canDelegate": false
         },
         "id": "/subscriptions/subId/resourcegroups/rgname/providers/Microsoft.Authorization/roleAssignments/roleassignmentId",
         "type": "Microsoft.Authorization/roleAssignments",
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetAllRoleAssignments.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetAllRoleAssignments.json
index fb5d95543c36..df29cf356b4a 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetAllRoleAssignments.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetAllRoleAssignments.json
@@ -11,8 +11,9 @@
             "properties": {
               "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
               "principalId": "Pid",
+              "principalType": "Ptype",
               "scope": "/subscriptions/subId/resourcegroups/rgname",
-              "canDelegate":false
+              "canDelegate": false
             },
             "id": "/subscriptions/subId/resourcegroups/rgname/providers/Microsoft.Authorization/roleAssignments/roleassignmentId",
             "type": "Microsoft.Authorization/roleAssignments",
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentById.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentById.json
index 25e9c928b072..76938ede963e 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentById.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentById.json
@@ -9,6 +9,7 @@
         "properties": {
           "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
           "principalId": "Pid",
+          "principalType":  "Ptype",
           "scope": "/subscriptions/subId/resourcegroups/rgname",
           "canDelegate":false
         },
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByName.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByName.json
index 565c4321d019..236097f49d3f 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByName.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByName.json
@@ -11,8 +11,9 @@
         "properties": {
           "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
           "principalId": "Pid",
+          "principalType": "Ptype",
           "scope": "/subscriptions/subId/resourcegroups/rgname",
-          "canDelegate":false
+          "canDelegate": false
         },
         "id": "/subscriptions/subId/resourcegroups/rgname/providers/Microsoft.Authorization/roleAssignments/roleassignmentId",
         "type": "Microsoft.Authorization/roleAssignments",
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByScope.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByScope.json
index b37258d178bb..ec570a61ce58 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByScope.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentByScope.json
@@ -11,6 +11,7 @@
             "properties": {
               "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
               "principalId": "Pid",
+              "principalType":  "Ptype",
               "scope": "/subscriptions/subId/resourcegroups/rgname",
               "canDelegate":false
             },
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResource.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResource.json
index 0464db8bac19..0fe2980d59dc 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResource.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResource.json
@@ -16,8 +16,9 @@
             "properties": {
               "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
               "principalId": "Pid",
+              "principalType": "Ptype",
               "scope": "/subscriptions/subId/resourcegroups/rgname",
-              "canDelegate":false
+              "canDelegate": false
             },
             "id": "/subscriptions/subId/resourcegroups/rgname/providers/Microsoft.Authorization/roleAssignments/roleassignmentId",
             "type": "Microsoft.Authorization/roleAssignments",
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResourceGroup.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResourceGroup.json
index 5ef0fb9c83dd..20469c50be0c 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResourceGroup.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/GetRoleAssignmentsForResourceGroup.json
@@ -12,8 +12,9 @@
             "properties": {
               "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
               "principalId": "Pid",
+              "principalType": "Ptype",
               "scope": "/subscriptions/subId/resourcegroups/rgname",
-              "canDelegate":false
+              "canDelegate": false
             },
             "id": "/subscriptions/subId/resourcegroups/rgname/providers/Microsoft.Authorization/roleAssignments/roleassignmentId",
             "type": "Microsoft.Authorization/roleAssignments",
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignment.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignment.json
index 59cdae83f7b3..fee81783787c 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignment.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignment.json
@@ -18,8 +18,9 @@
         "properties": {
           "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
           "principalId": "Pid",
+          "principalType": "Ptype",
           "scope": "/subscriptions/subId/resourcegroups/rgname",
-          "canDelegate":false
+          "canDelegate": false
         },
         "id": "/subscriptions/subId/resourcegroups/rgname/providers/Microsoft.Authorization/roleAssignments/roleassignmentId",
         "type": "Microsoft.Authorization/roleAssignments",
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignmentById.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignmentById.json
index ddbaaea7afdb..b54ec5fd81bf 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignmentById.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/examples/PutRoleAssignmentById.json
@@ -6,8 +6,8 @@
       "properties": {
         "roleDefinitionId": "/subscriptions/4004a9fd-d58e-48dc-aeb2-4a4aec58606f/providers/Microsoft.Authorization/roleDefinitions/de139f84-1756-47ae-9be6-808fbbe84772",
         "principalId": "d93a38bc-d029-4160-bfb0-fbda779ac214",
-        "principalType":  "User",
-        "canDelegate":false
+        "principalType": "User",
+        "canDelegate": false
       }
     },
     "api-version": "2018-09-01-preview"
@@ -18,6 +18,7 @@
         "properties": {
           "roleDefinitionId": "/subscriptions/subId/providers/Microsoft.Authorization/roleDefinitions/roledefinitionId",
           "principalId": "Pid",
+          "principalType":  "Ptype",
           "scope": "/subscriptions/subId/resourcegroups/rgname",
           "canDelegate":false
         },