diff --git a/src/collision/TriangleVertexArray.cpp b/src/collision/TriangleVertexArray.cpp
index 3c6f0905..a37e99b0 100644
--- a/src/collision/TriangleVertexArray.cpp
+++ b/src/collision/TriangleVertexArray.cpp
@@ -29,6 +29,19 @@
 using namespace reactphysics3d;
 
 // Constructor
+/// Note that your data will not be copied into the TriangleVertexArray and
+/// therefore, you need to make sure that those data are always valid during
+/// the lifetime of the TriangleVertexArray.
+/**
+ * @param nbVertices Number of vertices in the array
+ * @param verticesStart Pointer to the first vertices of the array
+ * @param verticesStride Number of bytes between the beginning of two consecutive vertices
+ * @param nbTriangles Number of triangles in the array
+ * @param indexesStart Pointer to the first triangle index
+ * @param indexesStride Number of bytes between the beginning of two consecutive triangle indices
+ * @param vertexDataType Type of data for the vertices (float, double)
+ * @param indexDataType Type of data for the indices (short, int)
+ */
 TriangleVertexArray::TriangleVertexArray(uint nbVertices, void* verticesStart, int verticesStride,
                                          uint nbTriangles, void* indexesStart, int indexesStride,
                                          VertexDataType vertexDataType, IndexDataType indexDataType) {
diff --git a/src/collision/TriangleVertexArray.h b/src/collision/TriangleVertexArray.h
index 77d03dc3..ac4ce91b 100644
--- a/src/collision/TriangleVertexArray.h
+++ b/src/collision/TriangleVertexArray.h
@@ -39,7 +39,7 @@ namespace reactphysics3d {
  * into the array. It only stores pointer to the data. The purpose is to allow
  * the user to share vertices data between the physics engine and the rendering
  * part. Therefore, make sure that the data pointed by a TriangleVertexArray
- * remain valid during the TriangleVertexArray life.
+ * remains valid during the TriangleVertexArray life.
  */
 class TriangleVertexArray {
 
diff --git a/testbed/meshes/city.mtl b/testbed/meshes/city.mtl
deleted file mode 100644
index 70d3ba1d..00000000
--- a/testbed/meshes/city.mtl
+++ /dev/null
@@ -1,10 +0,0 @@
-# Blender MTL File: 'None'
-# Material Count: 1
-
-newmtl None
-Ns 0
-Ka 0.000000 0.000000 0.000000
-Kd 0.8 0.8 0.8
-Ks 0.8 0.8 0.8
-d 1
-illum 2