diff --git a/src/gpu/vertexbuffer.h b/src/gpu/vertexbuffer.h
index 8055a0b2..c6376fad 100644
--- a/src/gpu/vertexbuffer.h
+++ b/src/gpu/vertexbuffer.h
@@ -36,6 +36,10 @@ private:
     class VertexBufferData *m_data;
 };
 
+/* A safe enum to indicate how a vertex stream is going to be used. For
+ * now there is only TexCoord and not TexCoord0 TexCoord1 etc. because
+ * we can always reorganise the vertex declaration for the indices to
+ * match. If the need arises these enums will be added. */
 struct VertexUsage
 {
     enum Value
@@ -57,10 +61,12 @@ struct VertexUsage
     }
     m_value;
 
-    inline VertexUsage(Value v) { m_value = v; }
+    inline VertexUsage(Value v) : m_value(v) {}
     inline operator Value() { return m_value; }
 };
 
+/* A safe enum to indicate what kind of primitive to draw. Used in
+ * VertexDeclaration::DrawElements() for instance. */
 struct MeshPrimitive
 {
     enum Value
@@ -70,7 +76,7 @@ struct MeshPrimitive
     }
     m_value;
 
-    inline MeshPrimitive(Value v) { m_value = v; }
+    inline MeshPrimitive(Value v) : m_value(v) {}
     inline operator Value() { return m_value; }
 };
 
diff --git a/src/video.h b/src/video.h
index 7dcc4f87..05f86483 100644
--- a/src/video.h
+++ b/src/video.h
@@ -27,7 +27,7 @@ struct ClearMask
     enum Value
     {
         /* Note: D3D9 doesn't appear to support the accumulation buffer,
-         * and it is a deprecated OpenGL feature. No reasone to support it. */
+         * and it is a deprecated OpenGL feature. No reason to support it. */
         Color   = 1 << 0,
         Depth   = 1 << 1,
         Stencil = 1 << 2,
@@ -36,8 +36,8 @@ struct ClearMask
     }
     m_value;
 
-    inline ClearMask(Value v) { m_value = v; }
-    inline ClearMask(uint64_t i) { m_value = (Value)i; }
+    inline ClearMask(Value v) : m_value(v) {}
+    inline ClearMask(uint64_t i) : m_value((Value)i) {}
     inline operator Value() { return m_value; }
 };