diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-01-01-preview/authorization-RoleBasedCalls.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-01-01-preview/authorization-RoleBasedCalls.json
index 4651046b3edc..378c5e0d69e0 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-01-01-preview/authorization-RoleBasedCalls.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-01-01-preview/authorization-RoleBasedCalls.json
@@ -1142,6 +1142,10 @@
           "description": "The delgation flag used for creating a role assignment"
         }
       },
+      "required": [
+        "roleDefinitionId",
+        "principalId"
+      ],
       "description": "Role assignment properties."
     },
     "RoleAssignmentCreateParameters": {
@@ -1152,6 +1156,9 @@
           "description": "Role assignment properties."
         }
       },
+      "required": [
+        "properties"
+      ],
       "description": "Role assignment create parameters."
     },
     "Permission": {
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleBasedCalls.json b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleBasedCalls.json
index 74f038bcd9c8..bbc46a6d4c92 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleBasedCalls.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/preview/2018-09-01-preview/authorization-RoleBasedCalls.json
@@ -1162,6 +1162,10 @@
           "description": "The delgation flag used for creating a role assignment"
         }
       },
+      "required": [
+        "roleDefinitionId",
+        "principalId"
+      ],
       "description": "Role assignment properties."
     },
     "RoleAssignmentCreateParameters": {
@@ -1172,6 +1176,9 @@
           "description": "Role assignment properties."
         }
       },
+      "required": [
+        "properties"
+      ],
       "description": "Role assignment create parameters."
     },
     "Permission": {
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..8659ad8e2bef 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
@@ -6,7 +6,7 @@
       "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",
+        "principalType": "User",
         "canDelegate":false
       }
     },
diff --git a/specification/authorization/resource-manager/Microsoft.Authorization/stable/2015-07-01/authorization.json b/specification/authorization/resource-manager/Microsoft.Authorization/stable/2015-07-01/authorization.json
index 6db03a407311..3a80520e1ca2 100644
--- a/specification/authorization/resource-manager/Microsoft.Authorization/stable/2015-07-01/authorization.json
+++ b/specification/authorization/resource-manager/Microsoft.Authorization/stable/2015-07-01/authorization.json
@@ -1121,6 +1121,10 @@
           "description": "The principal ID assigned to the role. This maps to the ID inside the Active Directory. It can point to a user, service principal, or security group."
         }
       },
+      "required": [
+        "roleDefinitionId",
+        "principalId"
+      ],
       "description": "Role assignment properties."
     },
     "RoleAssignmentCreateParameters": {
@@ -1130,6 +1134,9 @@
           "description": "Role assignment properties."
         }
       },
+      "required": [
+        "properties"
+      ],
       "description": "Role assignment create parameters."
     },
     "RoleDefinitionProperties": {