diff --git a/src/main.cpp b/src/main.cpp
index ef99cec..2da5b2f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -38,6 +38,7 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #include <astro/stateVectorIndices.hpp>
+#include <iostream>
 
 #include "gfx.hpp"
 #include "icosphere.hpp"
@@ -45,6 +46,14 @@
 #include "orbiter.hpp"
 #include "widget.hpp"
 
+void keyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    if (key == GLFW_KEY_C && action == GLFW_PRESS)
+    {
+        std::cout << "lol!" << std::endl;
+    }
+}
+
 int main()
 {
     GLFWwindow* window = nullptr;
@@ -54,9 +63,9 @@ int main()
     GLuint litProgram = compileShaderProgram("./frag_lit.glsl");
     GLuint unlitProgram = compileShaderProgram("./frag_unlit.glsl");
 
+    // set up scene
     Icosphere planet(0.2, 3, litProgram);
 
-
     std::vector<float> keplerianElements(6);
     keplerianElements[astro::semiMajorAxisIndex] = .75;
     keplerianElements[astro::eccentricityIndex] = .5;
@@ -68,9 +77,18 @@ int main()
     Icosphere orbiterSphere(0.07, 2, litProgram);
     Orbiter orbiter(orbiterSphere, orbit, unlitProgram);
 
+    // register input
+    // TODO: init objects with a reference to the window so that they can register
+    // their own key inputs
+    glfwSetKeyCallback(window, keyCallback);
+
     // Main loop
     while (!glfwWindowShouldClose(window))
     {
+        // TODO: receive input from GLFW
+        glfwPollEvents();
+
+        // rendering
         glClearColor(0.2, 0.3, 0.3, 1.0);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
@@ -79,7 +97,6 @@ int main()
         orbiter.render(time);
 
         glfwSwapBuffers(window);
-        glfwPollEvents();
     }
 
     glfwTerminate();