diff --git a/README.md b/README.md
index 12826c3..cd279ff 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ This version has been thoroughly cleaned of artefacts and condensed into somethi
 
 Changes are welcome, especially conversion related ones. If you spot any issues whilst reading, please submit an issue and I'll correct it. Pull Requests are always welcome.
 
-There's some larger changes that could be made to help perserve the content longer term. I'd love to see some of the images converted to a vector representation so we can provide higher-resolution versions, and similarly formulas and maths could be represented in MathML.
+There's some larger changes that could be made to help preserve the content longer term. I'd love to see some of the images converted to a vector representation so we can provide higher-resolution versions, and similarly formulas and maths could be represented in MathML.
 
 ## Generating your own ebook
 
diff --git a/src/copyright.md b/src/copyright.md
index c0c4b83..f4240b4 100644
--- a/src/copyright.md
+++ b/src/copyright.md
@@ -2,7 +2,7 @@
 
 All rights belong to Michael Abrash. Reproduced with permission.
 
-This version was extracted from the PDFs which were [released by Michael Abrash and Dr. Dobbs in 2001](http://www.drdobbs.com/parallel/graphics-programming-black-book/184404919). The intention is to maintain a canonical electronic version of the book, and make it easier to read in other formats and on other devices than were available when the book was releaesed online.
+This version was extracted from the PDFs which were [released by Michael Abrash and Dr. Dobbs in 2001](http://www.drdobbs.com/parallel/graphics-programming-black-book/184404919). The intention is to maintain a canonical electronic version of the book, and make it easier to read in other formats and on other devices than were available when the book was released online.
 
 For comments, suggestions, and improvements contact James Gregory at [james@jagregory.com](mailto:james@jagregory.com).