diff --git a/src/engine/include/engine.hpp b/src/engine/include/engine.hpp
index 184910b..60ae78f 100644
--- a/src/engine/include/engine.hpp
+++ b/src/engine/include/engine.hpp
@@ -44,8 +44,6 @@ private:
     Game *game;
     s32 mainThreadId;
     static void wakeup(s32 t_alarmId, u16 t_time, void *t_common);
-
-    // ThreadManager threadManager;
 };
 
 #endif
diff --git a/src/engine/include/models/mesh.hpp b/src/engine/include/models/mesh.hpp
index 5e31b22..6b168bd 100644
--- a/src/engine/include/models/mesh.hpp
+++ b/src/engine/include/models/mesh.hpp
@@ -21,7 +21,10 @@
 #include <draw_sampling.h>
 #include "./anim_state.hpp"
 
-/** Class which have common types for all 3D objects */
+/** 
+ * Class which have contain 3D object data.
+ * External data can be loaded via loadXXX() methods.
+ */
 class Mesh
 {
 
@@ -51,7 +54,7 @@ public:
     /** Returns material, which is a mesh "subgroup". */
     MeshMaterial &getMaterial(const u32 &i) const { return frames[0].getMaterial(i); };
 
-    /** Auto count of frames. Static object (not animated) will have only 1 frame. */
+    /** Count of frames. Static object (not animated) will have only 1 frame. */
     const u32 &getFramesCount() const { return framesCount; };
 
     /** Count of vertices.  */
diff --git a/src/engine/include/models/mesh_material.hpp b/src/engine/include/models/mesh_material.hpp
index 025d3ab..0b5447e 100644
--- a/src/engine/include/models/mesh_material.hpp
+++ b/src/engine/include/models/mesh_material.hpp
@@ -15,7 +15,8 @@
 #include "./math/vector3.hpp"
 #include "./math/plane.hpp"
 
-/** Class which contains draw instructions for part mesh of mesh.
+/** 
+ * Class which contains draw instructions for part of mesh.
  * Mesh can have many materials.
  * For example, car mesh can have three materials:
  * body, tires and windows. 
diff --git a/src/engine/include/models/mesh_texture.hpp b/src/engine/include/models/mesh_texture.hpp
index f014801..e237d57 100644
--- a/src/engine/include/models/mesh_texture.hpp
+++ b/src/engine/include/models/mesh_texture.hpp
@@ -20,8 +20,8 @@
 
 /** 
  * Class which contains texture data.
- * Textures are paired with meshes via addUsage(),
- * removeUsage() functions which use meshId and materialId.
+ * Textures are paired with meshes via addLink() and 
+ * removeLink() functions which use meshId and materialId.
  */
 class MeshTexture
 {
diff --git a/src/engine/modules/audio.cpp b/src/engine/modules/audio.cpp
index dfded80..66892e4 100644
--- a/src/engine/modules/audio.cpp
+++ b/src/engine/modules/audio.cpp
@@ -78,7 +78,11 @@ void Audio::loadModules()
 {
     PRINT_LOG("Modules loading started (LIBSD, AUDSRV)");
     ret = SifLoadModule("rom0:LIBSD", 0, NULL);
+    if (ret == -203)
+        PRINT_ERR("LIBSD loading failed!");
     ret = SifLoadModule("host:AUDSRV.IRX", 0, NULL);
+    if (ret == -203)
+        PRINT_ERR("AUDSRV.IRX loading failed!");
     PRINT_LOG("Modules loaded");
 }