diff --git a/lib/command/flag-to-prompt.js b/lib/command/flag-to-prompt.js
index df4a8b9..cc5bf4b 100644
--- a/lib/command/flag-to-prompt.js
+++ b/lib/command/flag-to-prompt.js
@@ -15,5 +15,6 @@ function flagToPrompt(name, opt) {
   , 'when': opt.when
   , 'validate': opt.validate
   , 'filter': opt.filter
+  , 'transformer': opt.transformer
   }
 }
diff --git a/lib/command/index.js b/lib/command/index.js
index 3a7de77..c7f5fb0 100644
--- a/lib/command/index.js
+++ b/lib/command/index.js
@@ -2,7 +2,7 @@
 
 /**
  * Base command class for creating interactive cli programs
- * @module module:lib/command
+ * @module module:seeli/lib/command
  * @author Eric Satterwhite
  * @requires options
  * @requires events
@@ -31,6 +31,7 @@ const ora = require('ora')
 const toArray = require('mout/lang/toArray')
 const isFunction = require('mout/lang/isFunction')
 const hasOwn = require('mout/object/hasOwn')
+const typecast = require('mout/string/typecast')
 const toPrompt = require('./flag-to-prompt')
 const Registry = require('../registry')
 const conf = require('../conf')
@@ -346,7 +347,7 @@ class Command extends Registry {
       const current = this.options.flags[flag]
       if (current.interactive === false) continue
       if (Array.isArray(current.type)) {
-        answers[flag] = await ask(flag, cmd, current, this[kPrompt])
+        answers[flag] = await ask(flag, current, this[kPrompt])
         continue
       }
       const arg = toQuestion(flag, current, answers)
@@ -357,7 +358,13 @@ class Command extends Registry {
     this.parsed = {...this.parsed, ...answers}
 
     for (const [flag, answer] of Object.entries(answers)) {
-      args.push(`--${flag}=${answer}`)
+      if (Array.isArray(answer)) {
+        for (const value of answer) {
+          args.push(`--${flag}=${value}`)
+        }
+      } else {
+        args.push(`--${flag}=${answer}`)
+      }
       object.set(this.parsed, flag, answer)
     }
 
@@ -507,10 +514,22 @@ class Command extends Registry {
     return this.register(...args)
   }
 
+  /**
+   * @typedef {Object} Prompt
+   * @property {String} type
+   * @property {String} name
+   * @property {String} message
+   * @property {?String[]} choices
+   * @property {?String|Number|Boolean} default
+   * @property {?Function} when
+   * @property {?Function} validate
+   * @property {?Function} filter
+   **/
+
   /**
    * Convert all registered flags to inquierer compatible prompt objects
    * @method module:seeli/lib/command#toPrompt
-   * @returns {Object[]} array of inquirer prompt objects
+   * @returns {Prompt[]} array of inquirer prompt objects
    **/
   toPrompt() {
     const prompts = []
@@ -538,12 +557,19 @@ async function ask(name, opts, inquirer) {
   const question = toQuestion(name, opts)
   while (true) {
     const answer = await inquirer(question)
-    if (answer[name] === '') break
-    results.push(answer[name])
+    const value = typecast(answer[name])
+    if (value === '') break
+    if (question.type === 'number' && isNaN(value)) break
+    results.push(value)
   }
   return results
 }
 
+function transform(input, answers, status) {
+  if (!status.isFinal) return input
+  if (this.type === 'number' && isNaN(input)) return ''
+  return chalk.cyan(input)
+}
 function toQuestion(flag, opts, answers) {
   const arg = toPrompt(flag, opts)
 
@@ -553,6 +579,7 @@ function toQuestion(flag, opts, answers) {
   arg.when = opts.when ? opts.when.bind(null, answers) : undefined
   arg.validate = opts.validate ? opts.validate.bind(null, answers) : undefined
   arg.filter = opts.filter ? opts.filter.bind(null, answers) : undefined
+  arg.transformer = opts.transformer ? opts.transformer : transform.bind(arg)
   return arg
 }
 
diff --git a/lib/seeli.js b/lib/seeli.js
index 1d0cdc4..7764888 100644
--- a/lib/seeli.js
+++ b/lib/seeli.js
@@ -1,5 +1,11 @@
 'use strict'
-
+/**
+ * @module module:seeli/lib/seeli
+ * @requires mout/lang/toArray
+ * @requires mout/lang/kindOf
+ * @requires seeli/lib/command
+ * @requires seeli/lib/conf
+ **/
 const chalk = require('chalk')
 const toArray = require('mout/lang/toArray')
 const kindOf = require('mout/lang/kindOf')
@@ -7,6 +13,12 @@ const Command = require('./command')
 const config = require('./conf.js')
 const {PluginException} = require('./exceptions.js')
 
+/**
+ * Seeli Entrypoint used for registring and managing commands
+ * @constructor
+ * @alias module:seeli/lib/seeli
+ * @extends module:seeli/lib/command
+ **/
 class Seeli extends Command {
   constructor(...args) {
     super({
diff --git a/test/flag-to-prompt.js b/test/flag-to-prompt.js
index 3382235..f5641c2 100644
--- a/test/flag-to-prompt.js
+++ b/test/flag-to-prompt.js
@@ -17,6 +17,7 @@ test('flagToPrompt', async (t) => {
     , when: undefined
     , validate: undefined
     , filter: undefined
+    , transformer: undefined
     })
   })
 
@@ -29,6 +30,7 @@ test('flagToPrompt', async (t) => {
     , when: () => {}
     , validate: () => {}
     , filter: () => {}
+    , transformer: () => {}
     })
 
     t.match(out, {
@@ -39,6 +41,7 @@ test('flagToPrompt', async (t) => {
     , when: Function
     , validate: Function
     , filter: Function
+    , transformer: Function
     })
   })
 }).catch(threw)