diff --git a/CMakeLists.txt b/CMakeLists.txt
index f3536df..7131fda 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,6 +26,10 @@ find_package(GLEW REQUIRED)
 find_package(GLM REQUIRED)
 find_package(assimp REQUIRED)
 
+if (assimp_VERSION VERSION_LESS "5.1")
+    message(FATAL_ERROR "Assimp ${assimp_VERSION} out of date, Assimp 5.1.0 or newer is required!")
+endif()
+
 include_directories(
     ${SDL2_INCLUDE_DIRS}
     ${SDL2_IMAGE_DIRS}
diff --git a/data/shaders/pbrFragment.glsl b/data/shaders/pbrFragment.glsl
index e197162..7003b45 100644
--- a/data/shaders/pbrFragment.glsl
+++ b/data/shaders/pbrFragment.glsl
@@ -29,8 +29,6 @@ uniform sampler2D texture_diffuse3;
 uniform sampler2D texture_specular1;
 uniform sampler2D texture_specular2;
 
-uniform sampler2D ourTexture;
-
 // PBR functions from learnOpenGL.com
 const float PI = 3.14159265359;
 
@@ -74,7 +72,7 @@ float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
 
 void main()
 {
-   albedo = vec3(texture(texture_diffuse1, ourTexCoord));
+   //albedo = vec3(texture(texture_diffuse1, ourTexCoord));
    // Establish ambient lighting
    float ambientStrength = 0.1;
 
@@ -87,7 +85,7 @@ void main()
    vec3 V = normalize(CameraPos - WorldPos);
 
    vec3 Lo = vec3(0.0f);
-   //TODO: Loop through this block for the number of lights
+   //TODO: Loop through the code up to ambient definition for each light
    vec3 L = normalize(lightPosition - WorldPos);
    vec3 H = normalize(V - L);
    float distance = length(lightPosition - WorldPos);