Added comments

src/index.js

@@ -5,13 +5,18 @@ const defaultComponentName = 'modal'
 
 const Plugin = {
   install (Vue, options = {}) {
+    /**
+     * Makes sure that plugin can be insstalled only once
+     */
     if (this.installed) {
       return
     }
 
     this.installed = true
     this.event = new Vue()
-
+    /**
+     * Plugin API
+     */
     Vue.prototype.$modal = {
       show (name, params) {
         Plugin.event.$emit('toggle', name, true, params)
@@ -25,10 +30,14 @@ const Plugin = {
         Plugin.event.$emit('toggle', name, undefined, params)
       }
     }
-
+    /**
+     * Sets custom component name (if provided)
+     */
     const componentName = options.componentName || defaultComponentName
     Vue.component(componentName, Modal)
-
+    /**
+     * Registration of <Dialog/> component
+     */
     if (options.dialog) {
       Vue.component('v-dialog', Dialog)
     }