diff --git a/libs/live-fns/coveralls.js b/libs/live-fns/coveralls.js
index 2726413..1823b95 100644
--- a/libs/live-fns/coveralls.js
+++ b/libs/live-fns/coveralls.js
@@ -2,17 +2,22 @@ const axios = require('../axios.js')
 const covColor = require('../utils/cov-color.js')
 
 module.exports = async function (topic, platform, user, repo, branch) {
-  // only support topic="c" fow now
-
   const query = branch ? `?branch=${branch}` : ''
   const endpoint = `https://coveralls.io/${platform}/${user}/${repo}.json${query}`
 
   /* eslint-disable camelcase */
   const { covered_percent } = await axios.get(endpoint).then(res => res.data)
 
-  return {
-    subject: 'coverage',
-    status: Number(covered_percent.toFixed(1)) + '%',
-    color: covColor(covered_percent)
+  switch (topic) {
+    case 'c':
+      return {
+        subject: 'coverage',
+        status: Number(covered_percent.toFixed(1)) + '%',
+        color: covColor(covered_percent)
+      }
+    default:
+      return {
+        status: 'unknown topic'
+      }
   }
 }