diff --git a/lib/readline-sync.js b/lib/readline-sync.js
index 7aeb492..305bd07 100644
--- a/lib/readline-sync.js
+++ b/lib/readline-sync.js
@@ -29,7 +29,9 @@ var
     noTrim:         false,
     encoding:       'utf8',
     bufferSize:     1024,
-    print:          void 0
+    print:          void 0,
+    isTrue:         [],
+    isFalse:        []
   },
   useExt = false,
 
@@ -203,7 +205,7 @@ function _readlineSync(options) {
       options.encoding);
   }
 
-  return options.noTrim || options.keyIn ? input : input.trim();
+  return (options.noTrim || options.keyIn ? input : input.trim());
 }
 
 function readlineExt(options) {
@@ -439,6 +441,8 @@ function margeOptions() {
           break;
         // array
         case 'limit':                       // *    *     readlineExt
+        case 'isTrue':                      //      *
+        case 'isFalse':                     //      *
 /* jshint eqnull:true */
           options[optionName] = value != null ?
             flattenArray(value, function(value) {
@@ -473,14 +477,14 @@ function flattenArray(array, validator) {
   return flatArray;
 }
 
-function isMatchedLimit(res, limit, caseSensitive) {
-  return !limit.length || limit.some(function(valid) {
-    if (typeof valid === 'number') { valid += ''; }
-    return typeof valid === 'string' ? (
+function isMatched(res, comps, caseSensitive) {
+  return comps.some(function(comp) {
+    if (typeof comp === 'number') { comp += ''; }
+    return (typeof comp === 'string' ? (
         caseSensitive ?
-          res === valid : res.toLowerCase() === valid.toLowerCase()
+          res === comp : res.toLowerCase() === comp.toLowerCase()
         ) :
-      valid instanceof RegExp ? valid.test(res) : false;
+      comp instanceof RegExp ? comp.test(res) : false);
   });
 }
 
@@ -490,13 +494,22 @@ function readlineWithOptions(options) {
   options.limit = ''; // for readlineExt
   while (true) {
     res = _readlineSync(options);
-    if (isMatchedLimit(res, limitSave, options.caseSensitive)) { break; }
+    if (!limitSave.length ||
+      isMatched(res, limitSave, options.caseSensitive)) { break; }
     options.display += (options.display ? '\n' : '') +
       (options.limitMessage ? options.limitMessage + '\n' : '') + displaySave;
   }
   return res;
 }
 
+function toBool(res, options) {
+  return (
+    (options.isTrue.length &&
+      isMatched(res, options.isTrue, options.caseSensitive)) ? true :
+    (options.isFalse.length &&
+      isMatched(res, options.isFalse, options.caseSensitive)) ? false : res);
+}
+
 // for dev
 exports._useExtSet = function(use) { useExt = use; };
 
@@ -504,8 +517,7 @@ exports.prompt = function(options) {
   var readOptions = margeOptions(true, options), res;
   readOptions.display = readOptions.prompt;
   res = readlineWithOptions(readOptions);
-
-  return res;
+  return toBool(res, readOptions);
 };
 
 exports.question = function(query, options) {
@@ -513,8 +525,7 @@ exports.question = function(query, options) {
       display:        query
     }),
     res = readlineWithOptions(readOptions);
-
-  return res;
+  return toBool(res, readOptions);
 };
 
 exports.keyIn = function(query, options) {
@@ -528,7 +539,20 @@ exports.keyIn = function(query, options) {
       { return typeof value === 'string' || typeof value === 'number'; })
     .join('').replace(/\n/g, '').replace(/[^A-Za-z0-9_ ]/g, '\\$&');
   res = _readlineSync(readOptions);
-  return res;
+
+  ['isTrue', 'isFalse'].forEach(function(optionName) {
+    var comps = [];
+    readOptions[optionName].forEach(function(comp) {
+      if (typeof comp === 'string' || typeof comp === 'number') {
+        comps = comps.concat((comp + '').split(''));
+      } else if (comp instanceof RegExp) {
+        comps.push(comp);
+      }
+    });
+    readOptions[optionName] = comps;
+  });
+
+  return toBool(res, readOptions);
 };
 
 exports.setDefault = function(options) {
diff --git a/package.json b/package.json
index 558c513..f804e11 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "readline-sync",
-  "version": "0.11.0",
+  "version": "0.12.0",
   "title": "readlineSync",
   "description": "Synchronous Readline for interactively running to have a conversation with the user via a console(TTY).",
   "keywords": [