doc: Added note on compound Ids

docs/core/document-ids.md

@@ -2,6 +2,10 @@
 
 Chroma is unopinionated about document IDs and delegates those decisions to the user. This frees users to build semantics around their IDs.
 
+## Note on Compound IDs
+
+While you can choose to use IDs that are composed of multiple sub-IDs (e.g. `user_id` + `document_id`), it is important to highlight that Chroma does not support querying by partial ID.
+
 ## Common Practices
 
 ### UUIDs
@@ -80,4 +84,4 @@ collection.add(ids=[generate_sha256_hash_from_text(documents[i]) for i in range(
 In this section we'll explore a few different use cases for building semantics around document IDs.
 
 - URL Slugs - if your docs are web pages with permalinks (e.g. blog posts), you can use the URL slug as the document ID.
-- File Paths - if your docs are files on disk, you can use the file path as the document ID.
+- File Paths - if your docs are files on disk, you can use the file path as the document ID.