diff --git a/include/CVertexBuffer.h b/include/CVertexBuffer.h
index 40a4d037..cf569e60 100644
--- a/include/CVertexBuffer.h
+++ b/include/CVertexBuffer.h
@@ -26,6 +26,7 @@ namespace scene
 
 			virtual void push_back (const video::S3DVertex &element) =0;
 			virtual void setValue(u32 index, const video::S3DVertex &value) =0;
+			virtual video::S3DVertex& operator [](u32 index) = 0;
 			virtual video::S3DVertex& operator [](const u32 index) const =0;
 			virtual video::S3DVertex& getLast() =0;
 			virtual void set_used(u32 usedNow) =0;
@@ -51,6 +52,9 @@ namespace scene
 			virtual void setValue(u32 index, const video::S3DVertex &value) IRR_OVERRIDE
 			{Vertices[index] = (T&)value;}
 
+			virtual video::S3DVertex& operator [](u32 index) IRR_OVERRIDE
+			{return (video::S3DVertex&)Vertices[index];}
+
 			virtual video::S3DVertex& operator [](const u32 index) const IRR_OVERRIDE
 			{return (video::S3DVertex&)Vertices[index];}
 
@@ -158,6 +162,11 @@ namespace scene
 			Vertices->setValue(index, value);
 		}
 
+		virtual video::S3DVertex& operator [](u32 index) IRR_OVERRIDE
+		{
+			return (*Vertices)[index];
+		}
+
 		virtual video::S3DVertex& operator [](const u32 index) const IRR_OVERRIDE
 		{
 			return (*Vertices)[index];
diff --git a/include/IVertexBuffer.h b/include/IVertexBuffer.h
index 0fc3b237..e201a5b4 100644
--- a/include/IVertexBuffer.h
+++ b/include/IVertexBuffer.h
@@ -37,12 +37,14 @@ namespace scene
 		//* Note that depending on vertex type reference has to be one of the types derived from video::S3DVertex. */
 		virtual void push_back(const video::S3DVertex &element) =0;
 
-		//! Set value at index. 
-		/** Depending on vertex type reference has to be one of the types derived from video::S3DVertex.
-		Buffer must be already large enough. This is basically the non const version of operator [] */
+		//! Set value at index. Buffer must be already large enough that element exists.
+		/** Depending on vertex type reference has to be one of the types derived from video::S3DVertex */
 		virtual void setValue(u32 index, const video::S3DVertex &value) =0;
 
-		// Note that the reference can also be to one of the derived types
+		// Note that the reference can also be to one of the types derived from video::S3DVertex.
+		// This is especially important for the non const access version - you need to have the correct type and do some casting
+		// if you write vertices. 
+		virtual video::S3DVertex& operator [](u32 index) = 0;
 		virtual video::S3DVertex& operator [](const u32 index) const =0;
 		virtual video::S3DVertex& getLast() =0;