diff --git a/doc/schema_template.md b/doc/schema_template.md
index 2b48dd0e0faa..679d839d3f92 100644
--- a/doc/schema_template.md
+++ b/doc/schema_template.md
@@ -82,6 +82,7 @@ $tag:tool|outputs|data|actions|action://complexType[@name='Action']
 $tag:tool|outputs|data|actions|action|option://complexType[@name='ActionsOption']
 $tag:tool|outputs|data|discover_datasets://complexType[@name='OutputDiscoverDatasets']
 $tag:tool|outputs|collection://complexType[@name='OutputCollection']
+$tag:tool|outputs|collection|data://complexType[@name='OutputCollectionDataElement']
 $tag:tool|outputs|collection|filter://complexType[@name='OutputFilter']
 $tag:tool|outputs|collection|discover_datasets://complexType[@name='OutputCollectionDiscoverDatasets']
 $tag:tool|tests://complexType[@name='Tests']
diff --git a/lib/galaxy/tool_util/xsd/galaxy.xsd b/lib/galaxy/tool_util/xsd/galaxy.xsd
index 8f46e0c23f41..3a60a9ce2e12 100644
--- a/lib/galaxy/tool_util/xsd/galaxy.xsd
+++ b/lib/galaxy/tool_util/xsd/galaxy.xsd
@@ -5414,6 +5414,13 @@ on Human (hg18)``.
   </xs:group>
 
   <xs:complexType name="OutputCollectionDataElement">
+    <xs:annotation>
+      <xs:documentation xml:lang="en"><![CDATA[
+
+This tag set is contained within the ``<collection>`` tag set, and can be used to
+define the elements of a collection statically. See also [Planemo's documentation](https://planemo.readthedocs.io/en/latest/writing_advanced.html#static-element-count).
+]]></xs:documentation>
+    </xs:annotation>
     <xs:sequence>
       <xs:group ref="OutputCollectionElement" minOccurs="0" maxOccurs="unbounded" />
     </xs:sequence>