diff --git a/.gitignore b/.gitignore
index 68b9e277..d974f3d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules/
 bower_components/
+.idea
\ No newline at end of file
diff --git a/lib/nlp.js b/lib/nlp.js
index 857ba9f8..04b3743b 100644
--- a/lib/nlp.js
+++ b/lib/nlp.js
@@ -134,7 +134,8 @@ var common = [
     'count', 'until', 'interval',
     'byweekday', 'bymonthday', 'bymonth'
 ];
-ToText.IMPLEMENTED[RRule.DAILY]   = common;
+ToText.IMPLEMENTED[RRule.HOURLY]  = common;
+ToText.IMPLEMENTED[RRule.DAILY]   = ['byhour'].concat(common);
 ToText.IMPLEMENTED[RRule.WEEKLY]  = common;
 ToText.IMPLEMENTED[RRule.MONTHLY] = common;
 ToText.IMPLEMENTED[RRule.YEARLY]  = ['byweekno', 'byyearday'].concat(common);
@@ -214,6 +215,17 @@ ToText.prototype = {
         return this.text.join('');
     },
 
+    HOURLY: function() {
+        var gettext = this.gettext;
+        if (this.options.interval != 1) {
+            this.add(this.options.interval);
+        }
+
+        this.add(this.plural(this.options.interval)
+           ? gettext('hours') :  gettext('hour'));
+
+    },
+
     DAILY: function() {
         var gettext = this.gettext;
         if (this.options.interval != 1) {
@@ -238,6 +250,8 @@ ToText.prototype = {
             this._bymonthday();
         } else if (this.byweekday) {
             this._byweekday();
+        } else if (this.origOptions.byhour) {
+            this._byhour();
         }
 
     },
@@ -387,6 +401,12 @@ ToText.prototype = {
         }
     },
 
+    _byhour: function() {
+        var gettext = this.gettext;
+        this.add(gettext('at'))
+          .add(this.list(this.origOptions.byhour, null, gettext('and')));
+    },
+
     _bymonth: function() {
         this.add(this.list(this.options.bymonth,
                            this.monthtext,
@@ -584,7 +604,7 @@ var parseText = function(text, language) {
         case 'day(s)':
             options.freq = RRule.DAILY;
             if (ttr.nextSymbol()) {
-                ON();
+                AT();
                 F();
             }
             break;
@@ -612,6 +632,14 @@ var parseText = function(text, language) {
             }
             break;
 
+        case 'hour(s)':
+            options.freq = RRule.HOURLY;
+            if (ttr.nextSymbol()) {
+                ON();
+                F();
+            }
+            break;
+
         case 'month(s)':
             options.freq = RRule.MONTHLY;
             if (ttr.nextSymbol()) {
@@ -775,6 +803,32 @@ var parseText = function(text, language) {
         } while (ttr.accept('comma') || ttr.accept('the') || ttr.accept('on'));
     }
 
+    function AT() {
+
+        var at = ttr.accept('at');
+        if(!at) {
+            return;
+        }
+
+        do {
+            var n;
+            if(!(n = ttr.accept('number'))) {
+                throw new Error('Unexpected symbol ' + ttr.symbol
+                  + ', expected hour');
+            }
+            options.byhour = [n[0]];
+            while(ttr.accept('comma')) {
+                if(!(n = ttr.accept('number'))) {
+                    throw new Error('Unexpected symbol ' + ttr.symbol
+                      + '; expected hour');
+                }
+                options.byhour.push(n[0]);
+            }
+
+        } while (ttr.accept('comma') || ttr.accept('at'));
+    }
+
+
     function decodeM() {
         switch(ttr.symbol) {
         case 'january':
@@ -1006,9 +1060,11 @@ var ENGLISH = {
         'day(s)': /^days?/i,
         'weekday(s)': /^weekdays?/i,
         'week(s)': /^weeks?/i,
+        'hour(s)': /^hours?/i,
         'month(s)': /^months?/i,
         'year(s)': /^years?/i,
         'on': /^(on|in)/i,
+        'at': /^(at)/i,
         'the': /^the/i,
         'first': /^first/i,
         'second': /^second/i,
diff --git a/tests/tests.js b/tests/tests.js
index e6dc7fe6..cd13b765 100644
--- a/tests/tests.js
+++ b/tests/tests.js
@@ -25,11 +25,14 @@ module("RRule", {
 
 
 var texts = [
+    ['Every day', 'FREQ=DAILY'],
+    ['Every day at 10, 12 and 17', 'FREQ=DAILY;BYHOUR=10,12,17'],
+    ['Every week', 'FREQ=WEEKLY'],
+    ['Every hour', 'FREQ=HOURLY'],
+    ['Every 4 hours', 'INTERVAL=4;FREQ=HOURLY'],
     ['Every week on Tuesday', 'FREQ=WEEKLY;BYDAY=TU'],
     ['Every week on Monday, Wednesday', 'FREQ=WEEKLY;BYDAY=MO,WE'],
     ['Every weekday', 'FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR'],
-    ['Every day', 'FREQ=DAILY'],
-    ['Every week', 'FREQ=WEEKLY'],
     ['Every 2 weeks', 'INTERVAL=2;FREQ=WEEKLY'],
     ['Every month', 'FREQ=MONTHLY'],
     ['Every 6 months', 'INTERVAL=6;FREQ=MONTHLY'],
@@ -57,6 +60,17 @@ test('fromText()', function() {
 
 });
 
+test('toText()', function() {
+    $.each(texts, function(){
+        var text = this[0],
+          string = this[1];
+        console.log(text, string)
+        equal(RRule.fromString(string).toText().toLowerCase(), text.toLowerCase(),
+          string + ' => ' + text);
+    });
+
+});
+
 
 strings = [
     ['FREQ=WEEKLY;UNTIL=20100101T000000Z', 'FREQ=WEEKLY;UNTIL=20100101T000000Z'],