diff --git a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2020-06-01-preview/definitions.json b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2020-06-01-preview/definitions.json
index 5e30ab6fbcfc..03616a36d0a3 100644
--- a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2020-06-01-preview/definitions.json
+++ b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2020-06-01-preview/definitions.json
@@ -2963,7 +2963,7 @@
         },
         "identityClientId": {
           "type": "string",
-          "description": "SystemAssignedIdentity or UserAssignedIdentity Client Id which will be used to access key vault secret."
+          "description": "Null for SystemAssignedIdentity or Client Id for UserAssignedIdentity , which will be used to access key vault secret."
         }
       },
       "description": "Create keyVault contract details."
diff --git a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-01-01-preview/definitions.json b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-01-01-preview/definitions.json
index 095fe7e03a95..f2c25bb8c46b 100644
--- a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-01-01-preview/definitions.json
+++ b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-01-01-preview/definitions.json
@@ -3024,7 +3024,7 @@
         },
         "identityClientId": {
           "type": "string",
-          "description": "SystemAssignedIdentity or UserAssignedIdentity Client Id which will be used to access key vault secret."
+          "description": "Null for SystemAssignedIdentity or Client Id for UserAssignedIdentity , which will be used to access key vault secret."
         }
       },
       "description": "Create keyVault contract details."
diff --git a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-04-01-preview/definitions.json b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-04-01-preview/definitions.json
index 41161235a43b..7a88252c6247 100644
--- a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-04-01-preview/definitions.json
+++ b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-04-01-preview/definitions.json
@@ -3036,7 +3036,7 @@
         },
         "identityClientId": {
           "type": "string",
-          "description": "SystemAssignedIdentity or UserAssignedIdentity Client Id which will be used to access key vault secret."
+          "description": "Null for SystemAssignedIdentity or Client Id for UserAssignedIdentity , which will be used to access key vault secret."
         }
       },
       "description": "Create keyVault contract details."
diff --git a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/definitions.json b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/definitions.json
index c6d8ed869747..c83de02306cb 100644
--- a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/definitions.json
+++ b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/definitions.json
@@ -3036,7 +3036,7 @@
         },
         "identityClientId": {
           "type": "string",
-          "description": "SystemAssignedIdentity or UserAssignedIdentity Client Id which will be used to access key vault secret."
+          "description": "Null for SystemAssignedIdentity or Client Id for UserAssignedIdentity , which will be used to access key vault secret."
         }
       },
       "description": "Create keyVault contract details."
diff --git a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/stable/2020-12-01/definitions.json b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/stable/2020-12-01/definitions.json
index 283ef09f07d1..223ee2949a17 100644
--- a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/stable/2020-12-01/definitions.json
+++ b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/stable/2020-12-01/definitions.json
@@ -2967,7 +2967,7 @@
         },
         "identityClientId": {
           "type": "string",
-          "description": "SystemAssignedIdentity or UserAssignedIdentity Client Id which will be used to access key vault secret."
+          "description": "Null for SystemAssignedIdentity or Client Id for UserAssignedIdentity , which will be used to access key vault secret."
         }
       },
       "description": "Create keyVault contract details."