Unify capitalization of word OpenGL.

00/README.md

@@ -28,7 +28,7 @@ This book will focus on the use of GLSL pixel shaders. First we'll define what s
 
 What this book doesn't cover:
 
-* This *is not* an openGL or webGL book. OpenGL/webGL is a bigger subject than GLSL or fragment shaders. To learn more about openGL/webGL I recommend taking a look at:  [OpenGL Introduction](https://open.gl/introduction), [the 8th edition of the OpenGL Programming Guide](http://www.amazon.com/OpenGL-Programming-Guide-Official-Learning/dp/0321773039/ref=sr_1_1?s=books&ie=UTF8&qid=1424007417&sr=1-1&keywords=open+gl+programming+guide) (also known as the red book) or [WebGL: Up and Running](http://www.amazon.com/WebGL-Up-Running-Tony-Parisi/dp/144932357X/ref=sr_1_4?s=books&ie=UTF8&qid=1425147254&sr=1-4&keywords=webgl)
+* This *is not* an OpenGL or webGL book. OpenGL/webGL is a bigger subject than GLSL or fragment shaders. To learn more about OpenGL/webGL I recommend taking a look at:  [OpenGL Introduction](https://open.gl/introduction), [the 8th edition of the OpenGL Programming Guide](http://www.amazon.com/OpenGL-Programming-Guide-Official-Learning/dp/0321773039/ref=sr_1_1?s=books&ie=UTF8&qid=1424007417&sr=1-1&keywords=open+gl+programming+guide) (also known as the red book) or [WebGL: Up and Running](http://www.amazon.com/WebGL-Up-Running-Tony-Parisi/dp/144932357X/ref=sr_1_4?s=books&ie=UTF8&qid=1425147254&sr=1-4&keywords=webgl)
 
 * This *is not* a math book. Although we will cover a number of algorithms and techniques that rely on an understanding of algebra and trigonometry, we will not explain them in detail. For questions regarding the math I recommend keeping one of the following books nearby: [3rd Edition of Mathematics for 3D Game Programming and computer Graphics](http://www.amazon.com/Mathematics-Programming-Computer-Graphics-Third/dp/1435458869/ref=sr_1_1?ie=UTF8&qid=1424007839&sr=8-1&keywords=mathematics+for+games) or [2nd Edition of Essential Mathematics for Games and Interactive Applications](http://www.amazon.com/Essential-Mathematics-Games-Interactive-Applications/dp/0123742978/ref=sr_1_1?ie=UTF8&qid=1424007889&sr=8-1&keywords=essentials+mathematics+for+developers).
 

01/README.md

@@ -35,7 +35,7 @@ Another “super power” of the GPU is special math functions accelerated via h
 
 ## What is GLSL?
 
-GLSL stands for openGL Shading Language, which is the specific standard of shader programs you'll see in the following chapters. There are other types of shaders depending on hardware and Operating Systems. Here we will work with the openGL specs regulated by [Khronos Group](https://www.khronos.org/opengl/). Understanding the history of OpenGL can be helpful for understanding most of its weird conventions, for that I recommend taking a look at: [openglbook.com/chapter-0-preface-what-is-opengl.html](http://openglbook.com/chapter-0-preface-what-is-opengl.html)
+GLSL stands for OpenGL Shading Language, which is the specific standard of shader programs you'll see in the following chapters. There are other types of shaders depending on hardware and Operating Systems. Here we will work with the OpenGL specs regulated by [Khronos Group](https://www.khronos.org/opengl/). Understanding the history of OpenGL can be helpful for understanding most of its weird conventions, for that I recommend taking a look at: [openglbook.com/chapter-0-preface-what-is-opengl.html](http://openglbook.com/chapter-0-preface-what-is-opengl.html)
 
 ## Why are Shaders famously painful?