diff --git a/appendix/03/README.md b/appendix/03/README.md
index fcdc6d6..978d26b 100644
--- a/appendix/03/README.md
+++ b/appendix/03/README.md
@@ -1,17 +1,17 @@
 ## How can I collaborate with this book?
 
-Thanks for be willing to collaborate! There are plenty of ways you can:
+Thanks for being willing to collaborate! There are plenty of ways you can:
 
 - Translating content
 - Improving the [```glossary/``` section](https://github.com/patriciogonzalezvivo/thebookofshaders/tree/master/glossary)
 - Editing content
-- Sharing your shaders examples trough [the on-line editor](http://editor.thebookofshaders.com/) to 
+- Sharing your shaders examples through [the on-line editor](http://editor.thebookofshaders.com/) to 
 
 ### Translating content
 
-This book is wrote in [Markdown language](https://daringfireball.net/projects/markdown/syntax) so it's very easy to edit and work on it. 
+This book is written in [Markdown language](https://daringfireball.net/projects/markdown/syntax) so it's very easy to edit and work on it. 
 
-1. Start by going to [github's repository at ```github.com/patriciogonzalezvivo/thebookofshaders```](https://github.com/patriciogonzalezvivo/thebookofshaders). Take a look the files and folders inside it. You will note that the content is on the ```README.md``` and others files with capital letters like: ```TITLE.md```, ```SUMMARY.md```, etc. Also note that translations are hosted on files ending in two letters referencing the language they are on, ex.: ```README-jp.md```, ```README-es.md```, etc.
+1. Start by going to [github's repository at ```github.com/patriciogonzalezvivo/thebookofshaders```](https://github.com/patriciogonzalezvivo/thebookofshaders). Take a look at the files and folders inside it. You will note that the content is in the ```README.md``` and other files with capital letters like: ```TITLE.md```, ```SUMMARY.md```, etc. Also note that translations are hosted in files with names ending in two letters referencing the language they are for, ex.: ```README-jp.md```, ```README-es.md```, etc.
 
 2. Fork the repository and clone it in your computer.
 
@@ -45,13 +45,13 @@ Start running a local PHP server inside the local repository folder:
 php -S localhost:8000
 ```
 
-Then in your browser search for ```localhost:8000``` go to the chapter you are translating and add ```?lan=``` followed by the to letters your use to mark the language you are translating to. 
+Then in your browser search for ```localhost:8000``` go to the chapter you are translating and add ```?lan=``` followed by the two letters you used to mark the language you are translating to. 
 
-For examples if you are translate the chapter ```03``` to french you had been working the file ```03/README-fr.md``` and you can test it by going to: ```http://localhost:8000/03/?lan=fr```
+For example, if you are translating the chapter ```03``` to french you had been working with the file ```03/README-fr.md``` and you can test it by going to: ```http://localhost:8000/03/?lan=fr```
 
 ### Improving the glossary section
 
-This section is under development. We are happy to listen to your ideas on how to make it a friendly tools for all. Send us a message to [@bookofshaders](https://twitter.com/bookofshaders).
+This section is under development. We are happy to listen to your ideas on how to make it a friendly tool for all. Send us a message to [@bookofshaders](https://twitter.com/bookofshaders).
 
 ### Editing content