diff --git a/README.md b/README.md
index ef5cf2b..d0609a8 100644
--- a/README.md
+++ b/README.md
@@ -510,7 +510,7 @@ Insert vectors
 INSERT INTO items (embedding) VALUES ('{1:1,3:2,5:3}/5'), ('{1:4,3:5,5:6}/5');
 ```
 
-Note: Indices start at 1 like SQL arrays
+Note: The format is `{index1:value1,index2:value2,...}/dimensions` and indices start at 1 like SQL arrays
 
 Get the nearest neighbors by L2 distance