diff --git a/app/src/main/java/helium314/keyboard/settings/preferences/CustomFontPreference.kt b/app/src/main/java/helium314/keyboard/settings/preferences/CustomFontPreference.kt
index 37dac476b..3cd12f3c0 100644
--- a/app/src/main/java/helium314/keyboard/settings/preferences/CustomFontPreference.kt
+++ b/app/src/main/java/helium314/keyboard/settings/preferences/CustomFontPreference.kt
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-only
 package helium314.keyboard.settings.preferences
 
 import android.app.Activity