clarified uns requirements (#751)

chanzuckerberg · Feb 2, 2024 · 1b9d6f0 · 1b9d6f0
1 parent ed65bf8
commit 1b9d6f0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/schema/4.1.0/schema.md b/schema/4.1.0/schema.md
@@ -1328,7 +1328,7 @@ The size of the ndarray stored for a key in `varp` MUST NOT be zero.
 
 ## `uns` (Dataset Metadata)
 
-`uns` is a ordered dictionary with a `str` key. The size of the data stored as a value for a key in `uns` MUST NOT be zero.
+`uns` is a ordered dictionary with a `str` key. The data stored as a value for a key in `uns` MUST be a `bool` type, `NoneType`, or its size MUST NOT be zero.
 
 Curators MUST annotate the following keys and values in `uns`: