diff --git a/src/core/Engine.js b/src/core/Engine.js
index 660d68f..d0aafbb 100644
--- a/src/core/Engine.js
+++ b/src/core/Engine.js
@@ -19,7 +19,7 @@ var Engine = {};
     /**
      * Creates a new engine. The options parameter is an object that specifies any properties you wish to override the defaults.
      * All properties have default values, and many are pre-calculated automatically based on other properties.
-     * See the properites section below for detailed information on what you can pass via the `options` object.
+     * See the properties section below for detailed information on what you can pass via the `options` object.
      * @method create
      * @param {HTMLElement} element
      * @param {object} [options]
@@ -442,8 +442,8 @@ var Engine = {};
 
     /**
      * A `Boolean` that specifies if the `Engine.run` game loop should use a fixed timestep (otherwise it is variable).
-     * If timing is fixed, then the apparant simulation speed will change depending on the frame rate (but behaviour will be deterministic).
-     * If the timing is variable, then the apparant simulation speed will be constant (approximately, but at the cost of determininism).
+     * If timing is fixed, then the apparent simulation speed will change depending on the frame rate (but behaviour will be deterministic).
+     * If the timing is variable, then the apparent simulation speed will be constant (approximately, but at the cost of determininism).
      *
      * @property timing.isFixed
      * @type boolean
@@ -453,7 +453,7 @@ var Engine = {};
     /**
      * A `Number` that specifies the time step between updates in milliseconds.
      * If `engine.timing.isFixed` is set to `true`, then `delta` is fixed.
-     * If it is `false`, then `delta` can dynamically change to maintain the correct apparant simulation speed.
+     * If it is `false`, then `delta` can dynamically change to maintain the correct apparent simulation speed.
      *
      * @property timing.delta
      * @type number
@@ -501,4 +501,4 @@ var Engine = {};
      * @default a Matter.World instance
      */
 
-})();
\ No newline at end of file
+})();