diff --git a/src/6.pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.cpp b/src/6.pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.cpp
index 9828003..2121f63 100644
--- a/src/6.pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.cpp
+++ b/src/6.pbr/2.1.1.ibl_irradiance_conversion/ibl_irradiance_conversion.cpp
@@ -234,7 +234,7 @@ int main()
         pbrShader.setMat4("view", view);
         pbrShader.setVec3("camPos", camera.Position);
 
-        // render rows*column number of spheres with material properties defined by textures (they all have the same material properties)
+        // render rows*column number of spheres with varying metallic/roughness values scaled by rows and columns respectively
         glm::mat4 model = glm::mat4(1.0f);
         for (int row = 0; row < nrRows; ++row)
         {
diff --git a/src/6.pbr/2.1.2.ibl_irradiance/ibl_irradiance.cpp b/src/6.pbr/2.1.2.ibl_irradiance/ibl_irradiance.cpp
index cbd72b0..b9c27c2 100644
--- a/src/6.pbr/2.1.2.ibl_irradiance/ibl_irradiance.cpp
+++ b/src/6.pbr/2.1.2.ibl_irradiance/ibl_irradiance.cpp
@@ -279,7 +279,7 @@ int main()
         glActiveTexture(GL_TEXTURE0);
         glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
 
-        // render rows*column number of spheres with material properties defined by textures (they all have the same material properties)
+        // render rows*column number of spheres with varying metallic/roughness values scaled by rows and columns respectively
         glm::mat4 model = glm::mat4(1.0f);
         for (int row = 0; row < nrRows; ++row)
         {
diff --git a/src/6.pbr/2.2.1.ibl_specular/ibl_specular.cpp b/src/6.pbr/2.2.1.ibl_specular/ibl_specular.cpp
index 5b38b95..9d840cc 100644
--- a/src/6.pbr/2.2.1.ibl_specular/ibl_specular.cpp
+++ b/src/6.pbr/2.2.1.ibl_specular/ibl_specular.cpp
@@ -371,7 +371,7 @@ int main()
         glActiveTexture(GL_TEXTURE2);
         glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
 
-        // render rows*column number of spheres with material properties defined by textures (they all have the same material properties)
+        // render rows*column number of spheres with varying metallic/roughness values scaled by rows and columns respectively
         glm::mat4 model = glm::mat4(1.0f);
         for (int row = 0; row < nrRows; ++row)
         {