diff --git a/src/drawer.js b/src/drawer.js
index 032fa49b..0d7ce635 100644
--- a/src/drawer.js
+++ b/src/drawer.js
@@ -419,7 +419,7 @@ $.Drawer.prototype = {
 
 
     if(overlay.px !== undefined){
-        //if they specified 'px' so its in pixel coordinates so
+        //if they specified 'px' so it's in pixel coordinates so
         //we need to translate to viewport coordinates
         rect = drawer.viewport.imageToViewportRectangle( rect );
     }
@@ -438,7 +438,7 @@ $.Drawer.prototype = {
 /**
  * @private
  * @inner
- * Pretty much every other line in this needs to be documented so its clear
+ * Pretty much every other line in this needs to be documented so it's clear
  * how each piece of this routine contributes to the drawing process.  That's
  * why there are so many TODO's inside this function.
  */
diff --git a/src/viewport.js b/src/viewport.js
index 563a015e..0606769b 100644
--- a/src/viewport.js
+++ b/src/viewport.js
@@ -691,7 +691,7 @@ $.Viewport.prototype = {
     },
 
     /**
-     * Translates from a rectanlge which describes a portion of
+     * Translates from a rectangle which describes a portion of
      * the image in pixel coordinates to OpenSeadragon viewport
      * rectangle coordinates.
      */