diff --git a/src/pokenav_menu_handler_gfx.c b/src/pokenav_menu_handler_gfx.c
index a86d0be080..a4cdf48980 100644
--- a/src/pokenav_menu_handler_gfx.c
+++ b/src/pokenav_menu_handler_gfx.c
@@ -1316,6 +1316,9 @@ static void SetupPokenavMenuScanlineEffects(void)
     SetGpuRegBits(REG_OFFSET_WININ, WININ_WIN0_ALL);
     SetGpuRegBits(REG_OFFSET_WINOUT, WINOUT_WIN01_BG_ALL | WINOUT_WIN01_OBJ);
 #ifdef BUGFIX
+    // BUGFIX: Use full register write instead of |=.
+    // SetGpuRegBits left leftover window values from the Party screen,
+    // causing partial/missing glow highlights. SetGpuReg clears them fully.
     SetGpuReg(REG_OFFSET_WIN0V, DISPLAY_HEIGHT);
 #else
     SetGpuRegBits(REG_OFFSET_WIN0V, DISPLAY_HEIGHT);