diff --git a/doc/sound.txt b/doc/sound.txt
index b0bc64fa9..3b42b4c4e 100644
--- a/doc/sound.txt
+++ b/doc/sound.txt
@@ -230,7 +230,7 @@ assign_soundlib(soundlib_identifier)
 
 activate_chosen_soundlib(void)
 
-    -- If a soundlib is already active, indicated by gc.active_soundlib
+    -- If a soundlib is already active, indicated by ga.active_soundlib
        holding the identifier of one of the added soundlib integrations,
        then the sound_exit_nhsound() is called to turn it off or
        deactivate it.