diff --git a/xml/System/PlatformID.xml b/xml/System/PlatformID.xml
index 0ef0c858c55..10bb6085a35 100644
--- a/xml/System/PlatformID.xml
+++ b/xml/System/PlatformID.xml
@@ -132,7 +132,7 @@
       </ReturnValue>
       <MemberValue>7</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Any other operating system. This includes Browser (WASM).</summary>
       </Docs>
     </Member>
     <Member MemberName="Unix">