Merge pull request #17 from JSMonk/patch-2

Add the paragraph about WebAssembly `sourceMappingURL` section

source-map.bs

@@ -57,6 +57,12 @@ spec:bikeshed-1; type:dfn; for:railroad; text:optional
     "href": "https://docs.google.com/document/d/1xi12LrcqjqIHTtZzrzZKmQ3lbTv9mKrN076UB-j3UZQ/edit?hl=en_US",
     "publisher": "Google",
     "title": "Source Map Revision 2 Proposal"
+  },
+  "WasmCustomSection": {
+    "href": "https://www.w3.org/TR/wasm-core-2/binary/modules.html#custom-section",
+    "publisher": "W3C",
+    "status": "Living Standard",
+    "title": "WebAssembly custom section"
   }
 }
 </pre>
@@ -356,6 +362,7 @@ also accept `//@` but `//#` is preferred.
 
 This recommendation works well for JavaScript, it is expected that other source files will
 have different conventions.  For instance, for CSS `/*# sourceMappingURL=<url> */` is proposed.
+On the WebAssembly side, such URL should be placed as a UTF-8 encoded string in the custom section ([[WasmCustomSection]]) named `sourceMappingURL`. 
 
 `<url>` is a URL as defined in [[URL]]; in particular,
 characters outside the set permitted to appear in URIs must be percent-encoded