diff --git a/docs/api/index.md b/docs/api/index.md
index 159046c..df4fc0c 100644
--- a/docs/api/index.md
+++ b/docs/api/index.md
@@ -1,6 +1,8 @@
 # API
 
 ```{toctree}
+:maxdepth: 2
+
 nwb_linkml/index
 nwb_schema_language/index
 ```
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