diff --git a/schema/drafts/5.3.0.md b/schema/drafts/5.3.0.md
index 425c6f8a..75c597c1 100644
--- a/schema/drafts/5.3.0.md
+++ b/schema/drafts/5.3.0.md
@@ -476,7 +476,7 @@ Curators MUST annotate the following columns in the `obs` dataframe:
         <td>categorical with <code>str</code> categories. This MUST be a CL term or <code>"unknown"</code>. It MUST be <code>"unknown"</code> when:
         <ul>
         <li> no appropriate term can be found (e.g. the cell type is unknown)</li>
-        <li><code>assay_ontology_term_id</code> is <a href="https://www.ebi.ac.uk/ols4/ontologies/efo/classes?obo_id=EFO%3A0010961"><code>"EFO:0010961"</code></a> for <i>Visium Spatial Gene Expression</i>, <code>uns['spatial']['is_single']</code> is <code>True</code>, and the corresponding value of <code>in_tissue</code> is <code>0</code></li><br>The following terms MUST NOT be used:
+        <li><code>assay_ontology_term_id</code> is a descendant of <a href="https://www.ebi.ac.uk/ols4/ontologies/efo/classes?obo_id=EFO%3A0010961"><code>"EFO:0010961"</code></a> for <i>Visium Spatial Gene Expression</i>, <code>uns['spatial']['is_single']</code> is <code>True</code>, and the corresponding value of <code>in_tissue</code> is <code>0</code></li><br>The following terms MUST NOT be used:
         <ul><li>
           <a href="https://www.ebi.ac.uk/ols4/ontologies/cl/terms?obo_id=CL:0000255"><code>"CL:0000255"</code></a> for <i>eukaryotic cell</i>
         </li>