diff --git a/lib/ace/commands/default_commands.js b/lib/ace/commands/default_commands.js
index 9da2dd1d..8c33fc42 100644
--- a/lib/ace/commands/default_commands.js
+++ b/lib/ace/commands/default_commands.js
@@ -331,6 +331,16 @@ exports.commands = [{
     bindKey: bindKey("Ctrl-/", "Command-/"),
     exec: function(editor) { editor.toggleCommentLines(); },
     multiSelectAction: "forEach"
+}, {
+    name: "modifyNumberUp",
+    bindKey: bindKey("Ctrl-Shift-Up", "Alt-Shift-Up"),
+    exec: function(editor) { editor.modifyNumber(1); },
+    multiSelectAction: "forEach"
+}, {
+    name: "modifyNumberDown",
+    bindKey: bindKey("Ctrl-Shift-Down", "Alt-Shift-Down"),
+    exec: function(editor) { editor.modifyNumber(-1); },
+    multiSelectAction: "forEach"
 }, {
     name: "replace",
     bindKey: bindKey("Ctrl-R", "Command-Option-F"),
diff --git a/lib/ace/editor.js b/lib/ace/editor.js
index 67a296f8..339da815 100644
--- a/lib/ace/editor.js
+++ b/lib/ace/editor.js
@@ -1309,7 +1309,7 @@ var Editor = function(renderer, session) {
     /**
      * Editor.toggleCommentLines() 
      * 
-     * Given the currently selected range, this function either comments all lines or uncomments all lines (depending on whether it's commented or not).
+     * Given the currently selected range, this function either comments all the lines, or uncomments all of them.
      **/
     this.toggleCommentLines = function() {
         var state = this.session.getState(this.getCursorPosition().row);
@@ -1317,6 +1317,78 @@ var Editor = function(renderer, session) {
         this.session.getMode().toggleCommentLines(state, this.session, rows.first, rows.last);
     };
 
+    /**
+     * Editor.getNumberAt() -> Number
+     * 
+     * Works like [[Editor.getTokenAt]], except it returns a number.
+     **/
+    this.getNumberAt = function( row, column ) {
+        var _numberRx = /[\-]?[0-9]+(?:\.[0-9]+)?/g
+        _numberRx.lastIndex = 0
+
+        var s = this.session.getLine(row)
+        while(_numberRx.lastIndex < column - 1 ){
+            var m = _numberRx.exec(s)
+            if(m.index <= column && m.index+m[0].length >= column){
+                var number = {
+                    value: m[0],
+                    start: m.index,
+                    end: m.index+m[0].length
+
+                }
+                return number
+            }
+        }
+        return null;
+    };
+    /**
+     * Editor.modifyNumber(amount) 
+     * - amount (Number): The value to change the numeral by (can be negative to decrease value)
+     *
+     * If the character before the cursor is a number, this functions changes its value by `amount`.
+     **/
+    this.modifyNumber = function(amount) {
+        var row = this.selection.getCursor().row;
+        var column = this.selection.getCursor().column;
+
+        // get the char before the cursor
+        var charRange = new Range(row, column-1, row, column);
+
+        var c = this.session.getTextRange(charRange);
+        // if the char is a digit
+        if (!isNaN(parseFloat(c)) && isFinite(c)) {
+            // get the whole number the digit is part of
+            var nr = this.getNumberAt(row, column);
+            // if number found
+            if (nr) {
+                var fp = nr.value.indexOf(".") >= 0 ? nr.start + nr.value.indexOf(".") + 1 : nr.end;
+                var decimals = nr.start + nr.value.length - fp;
+
+                var t = parseFloat(nr.value);
+                t *= Math.pow(10, decimals);
+                
+
+                if(fp !== nr.end && column < fp){
+                    amount *= Math.pow(10, nr.end - column - 1);
+                } else {
+                    amount *= Math.pow(10, nr.end - column);
+                }
+                
+                t += amount;
+                t /= Math.pow(10, decimals);
+                var nnr = t.toFixed(decimals);
+
+                //update number
+                var replaceRange = new Range(row, nr.start, row, nr.end);
+                this.session.replace(replaceRange, nnr);
+
+                //reposition the cursor
+                this.moveCursorTo(row, Math.max(nr.start +1, column + nnr.length - nr.value.length));
+
+            }
+        }
+    };
+
     /** related to: EditSession.remove
      * Editor.removeLines() 
      *