diff --git a/schema/drafts/5.2.1-experimental.md b/schema/drafts/5.2.1-experimental.md
index 555330c1..1ccf5788 100644
--- a/schema/drafts/5.2.1-experimental.md
+++ b/schema/drafts/5.2.1-experimental.md
@@ -190,7 +190,7 @@ The following gene annotation dependencies are *pinned* for this version of the
             <td>
               <a href="https://www.ebi.ac.uk/ols4/ontologies/ncbitaxon/classes?obo_id=NCBITaxon%3A7227"><code>"NCBITaxon:7227"</code></a><br>for <i>Drosophila melanogaster</i>
             </td>
-            <td>MUST be ither the most accurate descendant of <a href="https://www.ebi.ac.uk/ols4/ontologies/fbbt/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FFBbt_00007002?lang=en"><code>FBbt:0007002</code></a> for <i>cell</i><br>or <code>"unknown"</code> when:
+            <td>MUST be ither the most accurate descendant of <a href="https://www.ebi.ac.uk/ols4/ontologies/fbbt/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FFBbt_00007002?lang=en"><code>FBbt:00007002</code></a> for <i>cell</i><br>or <code>"unknown"</code> when:
               <ul>
                <li>
                  no appropriate term can be found (e.g. the cell type is unknown)