diff --git a/include/GL/glfw.h b/include/GL/glfw.h
index c5dc8e0d..e8485c26 100644
--- a/include/GL/glfw.h
+++ b/include/GL/glfw.h
@@ -350,6 +350,18 @@ extern "C" {
 #define GLFW_AXES                 0x00050002
 #define GLFW_BUTTONS              0x00050003
 
+/* glfwGetError/glfwErrorString tokens */
+#define GLFW_NO_ERROR             0
+#define GLFW_NOT_INITIALIZED      0x00070001
+#define GLFW_INVALID_ENUM         0x00070002
+#define GLFW_INVALID_VALUE        0x00070003
+#define GLFW_OUT_OF_MEMORY        0x00070004
+#define GLFW_OPENGL_NOT_SUPPORTED 0x00070005
+#define GLFW_NO_PIXEL_FORMAT      0x00070006
+#define GLFW_VIDEO_MODE_FAILED    0x00070007
+#define GLFW_UNAVAILABLE_VERSION  0x00070008
+#define GLFW_NO_CURRENT_WINDOW    0x00070009
+#define GLFW_INTERNAL_ERROR       0x0007000A
 
 /*************************************************************************
  * Typedefs