diff --git a/include/GL/glfw3.h b/include/GL/glfw3.h
index 9d5ae7b..ee622b2 100644
--- a/include/GL/glfw3.h
+++ b/include/GL/glfw3.h
@@ -463,6 +463,8 @@
 typedef void (* GLFWscrollfun)(GLFWwindow,int,int);
 typedef void (* GLFWkeyfun)(GLFWwindow,int,int);
 typedef void (* GLFWcharfun)(GLFWwindow,int);
+typedef void* (* GLFWmallocfun)(size_t);
+typedef void (* GLFWfreefun)(void*);
 
 /* The video mode structure used by glfwGetVideoModes */
 typedef struct
@@ -482,6 +484,18 @@
     unsigned short blue[GLFW_GAMMA_RAMP_SIZE];
 } GLFWgammaramp;
 
+/* Custom memory allocator interface */
+typedef struct
+{
+    GLFWmallocfun malloc;
+    GLFWfreefun free;
+} GLFWallocator;
+
+/* Custom threading model interface */
+typedef struct
+{
+} GLFWthreadmodel;
+
 
 /*************************************************************************
  * Prototypes
@@ -489,6 +503,7 @@
 
 /* Initialization, termination and version querying */
 GLFWAPI int  glfwInit(void);
+GLFWAPI int  glfwInitWithModels(GLFWthreadmodel* threading, GLFWallocator* allocator);
 GLFWAPI void glfwTerminate(void);
 GLFWAPI void glfwGetVersion(int* major, int* minor, int* rev);
 GLFWAPI const char* glfwGetVersionString(void);