diff --git a/ebitenutil/file_js.go b/ebitenutil/file_js.go
index 35116b8f6..3df1d3e75 100644
--- a/ebitenutil/file_js.go
+++ b/ebitenutil/file_js.go
@@ -28,6 +28,13 @@ func (f *file) Close() error {
 	return nil
 }
 
+// OpenFile opens a file and returns a stream for its data.
+//
+// The path parts should be separated with slash '/' on any environments.
+//
+// OpenFile doesn't work on mobiles.
+//
+// Deprecated: as of v2.4. Use os.Open on desktops and http.Get on browsers instead.
 func OpenFile(path string) (ReadSeekCloser, error) {
 	res, err := http.Get(path)
 	if err != nil {
diff --git a/ebitenutil/file_notjs.go b/ebitenutil/file_notjs.go
index 104998630..e16a51935 100644
--- a/ebitenutil/file_notjs.go
+++ b/ebitenutil/file_notjs.go
@@ -26,7 +26,9 @@ import (
 //
 // The path parts should be separated with slash '/' on any environments.
 //
-// Note that this doesn't work on mobiles.
+// OpenFile doesn't work on mobiles.
+//
+// Deprecated: as of v2.4. Use os.Open on desktops and http.Get on browsers instead.
 func OpenFile(path string) (ReadSeekCloser, error) {
 	return os.Open(filepath.FromSlash(path))
 }
diff --git a/ebitenutil/io.go b/ebitenutil/io.go
index 9f5197123..bc5dba5da 100644
--- a/ebitenutil/io.go
+++ b/ebitenutil/io.go
@@ -19,6 +19,8 @@ import (
 )
 
 // ReadSeekCloser is io.ReadSeeker and io.Closer.
+//
+// Deprecated: as of v2.4. Use io.ReadSeekCloser instead.
 type ReadSeekCloser interface {
 	io.ReadSeeker
 	io.Closer