diff --git a/readme.md b/readme.md
index 96f19f69..8ee56f88 100644
--- a/readme.md
+++ b/readme.md
@@ -28,7 +28,7 @@ Thanks for contributing to the project by [submitting issues](https://github.com
 #include <glm/vec4.hpp> // glm::vec4
 #include <glm/mat4x4.hpp> // glm::mat4
 #include <glm/gtc/matrix_transform.hpp> // glm::translate, glm::rotate, glm::scale, glm::perspective
-#include <glm/gtc/constant.hpp> // glm::pi
+#include <glm/gtc/constants.hpp> // glm::pi
 
 glm::mat4 camera(float Translate, glm::vec2 const & Rotate)
 {