diff --git a/lib/feature.js b/lib/feature.js
index 256bd0a..d3e7198 100644
--- a/lib/feature.js
+++ b/lib/feature.js
@@ -4,6 +4,9 @@
  * Feature interface.
  */
 class Feature {
+  /**
+   * localWebServer instance passed to constructor in case feature needs access to http server instance.
+   */
   constructor (localWebServer) {}
 
   /**
diff --git a/package.json b/package.json
index 9c09fac..98d4f76 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "array-back": "^1.0.4",
     "command-line-args": "^4.0.1",
     "command-line-usage": "^4.0.0",
-    "config-master": "^2.1.0-0",
+    "config-master": "^3.0.0",
     "koa": "next",
     "koa-compose": "^3.1.0",
     "koa-convert": "^1.2.0",
@@ -52,7 +52,7 @@
     "walk-back": "^2.0.1"
   },
   "devDependencies": {
-    "jsdoc-to-markdown": "^2.0.1",
+    "jsdoc-to-markdown": "^3.0.0",
     "koa-cache-control": "^1.0.0",
     "koa-livereload": "~0.2.0",
     "req-then": "~0.5.1",