diff --git a/pixelgl/error.go b/pixelgl/error.go
index 9077856..48e5e90 100644
--- a/pixelgl/error.go
+++ b/pixelgl/error.go
@@ -5,12 +5,12 @@ import (
 	"github.com/pkg/errors"
 )
 
-// GetLastError returns (and consumes) the last error generated by OpenGL.
+// getLastError returns (and consumes) the last error generated by OpenGL inside the current Do, DoErr or DoVal.
 // If no error has been generated, this function returns nil.
 //
 // Call this function only inside the OpenGL thread (Do, DoErr or DoVal function). It's not guaranteed
 // to work correctly outside of it, because the thread swallows extra unchecked errors.
-func GetLastError() error {
+func getLastError() error {
 	err := uint32(gl.NO_ERROR)
 	for e := gl.GetError(); e != gl.NO_ERROR; e = gl.GetError() {
 		err = e
diff --git a/pixelgl/texture.go b/pixelgl/texture.go
index 06211f9..7d02e5e 100644
--- a/pixelgl/texture.go
+++ b/pixelgl/texture.go
@@ -34,7 +34,7 @@ func NewTexture(parent BeginEnder, width, height int, pixels []uint8) (*Texture,
 
 		gl.BindTexture(gl.TEXTURE_2D, 0)
 
-		return GetLastError()
+		return getLastError()
 	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to create a texture")
diff --git a/pixelgl/thread.go b/pixelgl/thread.go
index 555faef..03597da 100644
--- a/pixelgl/thread.go
+++ b/pixelgl/thread.go
@@ -16,7 +16,7 @@ func init() {
 	go func() {
 		runtime.LockOSThread()
 		for f := range callQueue {
-			GetLastError() // swallow unchecked errors
+			getLastError() // swallow unchecked errors
 			f()
 		}
 	}()
diff --git a/pixelgl/vertex.go b/pixelgl/vertex.go
index d46919a..8c0c09d 100644
--- a/pixelgl/vertex.go
+++ b/pixelgl/vertex.go
@@ -133,7 +133,7 @@ func NewVertexArray(parent BeginEnder, format VertexFormat, mode VertexDrawMode,
 		gl.BindBuffer(gl.ARRAY_BUFFER, 0)
 		gl.BindVertexArray(0)
 
-		return GetLastError()
+		return getLastError()
 	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to create a vertex array")
@@ -177,7 +177,7 @@ func (va *VertexArray) UpdateData(offset int, data []float64) error {
 		gl.BindBuffer(gl.ARRAY_BUFFER, va.vbo)
 		gl.BufferSubData(gl.ARRAY_BUFFER, 8*offset, 8*len(data), gl.Ptr(data))
 		gl.BindBuffer(gl.ARRAY_BUFFER, 0)
-		return GetLastError()
+		return getLastError()
 	})
 	if err != nil {
 		return errors.Wrap(err, "failed to update vertex array")