Fixed a few typos
diff --git a/UPGRADING.md b/UPGRADING.md
index da3758b..a702cfc 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -238,7 +238,7 @@
   imageList, err := images.ExtractImages(page)
 
   for _, i := range imageList {
-    // "i" will be a images.Image
+    // "i" will be an images.Image
   }
 })
 ```
@@ -284,7 +284,7 @@
   imageList, err := images.ExtractImages(page)
 
   for _, i := range imageList {
-    // "i" will be a images.Image
+    // "i" will be an images.Image
   }
 })
 ```