diff --git a/include/Refresh.h b/include/Refresh.h
index 4e071bf..c56f220 100644
--- a/include/Refresh.h
+++ b/include/Refresh.h
@@ -928,6 +928,11 @@ REFRESHAPI void REFRESH_SetTextureDataYUV(
 );
 
 /* Sets a region of the vertex buffer with client data.
+ *
+ * NOTE:
+ * 		Calling this function on a buffer after the buffer
+ * 		has been bound by BindVertexBuffers but before
+ * 		Present has been called is an error.
  *
  * buffer:		The vertex buffer to be updated.
  * offsetInBytes:	The starting offset of the buffer to write into.
@@ -945,6 +950,11 @@ REFRESHAPI void REFRESH_SetVertexBufferData(
 );
 
 /* Sets a region of the index buffer with client data.
+ *
+ * NOTE:
+ * 		Calling this function on a buffer after the buffer
+ * 		has been bound by BindIndexBuffer but before
+ * 		Present has been called is an error.
  *
  * buffer:		The index buffer to be updated.
  * offsetInBytes:	The starting offset of the buffer to write into.