diff --git a/client/src/components/Datatypes/model.ts b/client/src/components/Datatypes/model.ts
index 28e55257daa7..797d0349e199 100644
--- a/client/src/components/Datatypes/model.ts
+++ b/client/src/components/Datatypes/model.ts
@@ -14,6 +14,13 @@ export class DatatypesMapperModel {
         this.datatypesMapping = typesAndMapping.datatypes_mapping;
     }
 
+    /**
+     * Checks if a given child datatype is a subtype of a parent datatype.
+     * @param child - The child datatype extension as registered in the datatypes registry.
+     * @param parent - The parent datatype, which can be an extension or explicit class name
+     *                 Can also be used with extensionless abstract datatypes (e.g. "galaxy.datatypes.images.Image")
+     * @returns A boolean indicating whether the child is a subtype of the parent.
+     */
     isSubType(child: string, parent: string): boolean {
         const mapping = this.datatypesMapping;
         const childClassName = mapping.ext_to_class_name[child];