diff --git a/README.md b/README.md
index a8ac3a5..b9abc7f 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@
 |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |:-:  |
 | [](#-white-papers)  | [](#a-white-papers)  | [](#b-white-papers)  | [](#c-white-papers)  | [D](#d-white-papers)  | [](#e-white-papers)  | [](#f-white-papers)  | [](#g-white-papers)  | [](#h-white-papers)  |
 | [](#i-white-papers)  | [](#j-white-papers)  | [](#k-white-papers)  | [](#l-white-papers)  | [](#m-white-papers)  | [](#n-white-papers)  | [](#o-white-papers)  | [](#p-white-papers)  | [](#q-white-papers)  |
-| [](#r-white-papers)  | [](#s-white-papers)  | [](#t-white-papers)  | [](#u-white-papers)  | [](#v-white-papers)  | [](#w-white-papers)  | [](#x-white-papers)  | [](#y-white-papers)  | [](#z-white-papers) |
+| [](#r-white-papers)  | [S](#s-white-papers)  | [](#t-white-papers)  | [](#u-white-papers)  | [](#v-white-papers)  | [](#w-white-papers)  | [](#x-white-papers)  | [](#y-white-papers)  | [](#z-white-papers) |
 
 
 ---
@@ -231,6 +231,11 @@
 
 - [Amazon Dynamo](https://newsletter.systemdesign.one/p/amazon-dynamo-architecture)
 
+
+#### S white papers
+
+- [Google Spanner](https://newsletter.systemdesign.one/p/cloud-spanner-database)
+
 ---
 
 ## License