diff --git a/code/AssetLib/MDL/HalfLife/HL1MDLLoader.cpp b/code/AssetLib/MDL/HalfLife/HL1MDLLoader.cpp
index 237ccf3d8..f3a383e8e 100644
--- a/code/AssetLib/MDL/HalfLife/HL1MDLLoader.cpp
+++ b/code/AssetLib/MDL/HalfLife/HL1MDLLoader.cpp
@@ -470,6 +470,7 @@ void HL1MDLLoader::read_bones() {
 
     temp_bones_.resize(header_->numbones);
 
+    // Create the main 'bones' node that will contain all MDL root bones.
     aiNode *bones_node = new aiNode(AI_MDL_HL1_NODE_BONES);
     rootnode_children_.push_back(bones_node);
 
@@ -500,11 +501,11 @@ void HL1MDLLoader::read_bones() {
         temp_bones_[i].offset_matrix.Inverse();
     }
 
-    // Create the 'bones' root node that will contain all bone nodes.
+    // Allocate memory for each MDL root bone.
     bones_node->mNumChildren = static_cast<unsigned int>(roots.size());
     bones_node->mChildren = new aiNode *[bones_node->mNumChildren];
 
-    // Build all bones children hierarchy starting from each root bone.
+    // Build all bones children hierarchy starting from each MDL root bone.
     for (size_t i = 0; i < roots.size(); ++i)
     {
         const TempBone &root_bone = temp_bones_[roots[i]];
diff --git a/test/unit/ImportExport/MDL/utMDLImporter_HL1_Nodes.cpp b/test/unit/ImportExport/MDL/utMDLImporter_HL1_Nodes.cpp
index af6512c87..5a258d0a4 100644
--- a/test/unit/ImportExport/MDL/utMDLImporter_HL1_Nodes.cpp
+++ b/test/unit/ImportExport/MDL/utMDLImporter_HL1_Nodes.cpp
@@ -81,6 +81,7 @@ public:
         ASSERT_NE(nullptr, scene);
         ASSERT_NE(nullptr, scene->mRootNode);
 
+        // First, check that "<MDL_root>" and "<MDL_bones>" are linked.
         const aiNode* node_MDL_root = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_ROOT);
         ASSERT_NE(nullptr, node_MDL_root);
 
@@ -89,6 +90,7 @@ public:
         ASSERT_NE(nullptr, node_MDL_bones->mParent);
         ASSERT_EQ(node_MDL_root, node_MDL_bones->mParent);
 
+        // Second, verify "<MDL_bones>" hierarchy.
         const Hierarchy expected_hierarchy = {
             { 0, AI_MDL_HL1_NODE_BONES },
                 { 1, "root1_bone1" },