diff --git a/.config/mpv/input.conf b/.config/mpv/input.conf
index 41dc79f..7900858 100644
--- a/.config/mpv/input.conf
+++ b/.config/mpv/input.conf
@@ -4,4 +4,8 @@
 WHEEL_DOWN add volume -5
 WHEEL_UP add volume 5
 
+Alt+k add sub-font-size 1
+Alt+j add sub-font-size -1
+
 k playlist-shuffle
+