diff --git a/code/services-core/index-service/readme.md b/code/services-core/index-service/readme.md
index 4ff43a20..6ad8bbe6 100644
--- a/code/services-core/index-service/readme.md
+++ b/code/services-core/index-service/readme.md
@@ -2,6 +2,8 @@
 
 The index service knows which document contains which keywords. 
 
+![image](../../../doc/index-service-map.svg)
+
 ## Central Classes
 
 * [IndexService](src/main/java/nu/marginalia/index/IndexService.java) is the REST entry point that the internal API talks to.
@@ -15,4 +17,4 @@ The index service relies heavily on the primitives in [features-index](../../fea
 
 * [features-index/index-forward](../../features-index/index-forward/)
 * [features-index/index-reverse](../../features-index/index-reverse/)
-* [features-index/index-query](../../features-index/index-query)
\ No newline at end of file
+* [features-index/index-query](../../features-index/index-query)