Clarify Croissant availability and requirements for private datasets

README.md

@@ -97,12 +97,20 @@ Class IDs are globally consistent across all sites.
 
 ## Croissant status
 
-The Hub `/croissant` endpoint currently returns unavailable for this dataset (no Hub-parquet representation yet).
-
 Endpoint:
 
 ```text
 https://huggingface.co/api/datasets/kangnicui2/GoldMiningMDD/croissant
 ```
 
-To get auto-generated Croissant on Hugging Face, publish the dataset in a form that the Dataset Viewer can convert to Parquet (or already provides Parquet). Then the `/croissant` endpoint is generated automatically by the Hub.
+Current behavior for this repository: the endpoint is not available yet.
+
+Important platform note: the Hugging Face Dataset Viewer/Croissant service is powered by `datasets-server`, and private datasets require a plan that supports private dataset-server features (for many accounts this means PRO/Enterprise).
+
+How to get Croissant for this dataset:
+
+1. Keep this repo as dataset format compatible with Parquet conversion (already fine for Hub processing).
+2. Make sure dataset-server can run on this repo:
+   - Option A: make the dataset public; or
+   - Option B: use an account/org plan that supports private dataset-server.
+3. Once processed, query the endpoint above and use the returned JSON-LD as machine-readable Croissant metadata.