diff --git a/pixelgl/vertex.go b/pixelgl/vertex.go
index 658c06d..0ab8e80 100644
--- a/pixelgl/vertex.go
+++ b/pixelgl/vertex.go
@@ -149,8 +149,8 @@ func (va *VertexArray) ID() uint32 {
 	return va.vao
 }
 
-// Count returns the number of vertices in a vertex array.
-func (va *VertexArray) Count() int {
+// VertexNum returns the number of vertices in a vertex array.
+func (va *VertexArray) VertexNum() int {
 	return va.vertexNum
 }