diff --git a/specification/storage/data-plane/Microsoft.BlobStorage/preview/2019-12-12/blob.json b/specification/storage/data-plane/Microsoft.BlobStorage/preview/2019-12-12/blob.json
index 8aa07fcb7676..50028ddb521d 100644
--- a/specification/storage/data-plane/Microsoft.BlobStorage/preview/2019-12-12/blob.json
+++ b/specification/storage/data-plane/Microsoft.BlobStorage/preview/2019-12-12/blob.json
@@ -9556,6 +9556,9 @@
           "type": "string",
           "format": "date-time-rfc1123"
         },
+        "TagCount": {
+          "type": "integer"
+        },
         "Expiry-Time": {
           "x-ms-client-name": "ExpiresOn",
           "type": "string",