diff --git a/decls/postcss.js b/decls/postcss.js
index 782847f374..8de2232398 100644
--- a/decls/postcss.js
+++ b/decls/postcss.js
@@ -32,3 +32,14 @@ export type postcss$rule = {
   parent: Object,
   nodes: Array<Object>,
 }
+
+export type postcss$result = {
+  css: string,
+  root: Object,
+  stylelint: {
+    disabledRanges: disabledRangeObject,
+    ruleSeverities?: Object,
+    customMessages?: Object,
+    quiet?: boolean,
+  },
+}
diff --git a/lib/assignDisabledRanges.js b/lib/assignDisabledRanges.js
index ae34aeb877..e2452c6383 100644
--- a/lib/assignDisabledRanges.js
+++ b/lib/assignDisabledRanges.js
@@ -20,7 +20,7 @@ const ALL_RULES = "all"
 module.exports = function (
   root/*: Object*/,
   result/*: Object*/
-) {
+)/*: postcss$result*/ {
   result.stylelint = result.stylelint || {}
 
   // Most of the functions below work via side effects mutating