diff --git a/src/xdisp.c b/src/xdisp.c
index ca8fa5dffee..c1d6fedb553 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -26643,13 +26643,11 @@ display_line (struct it *it, int cursor_vpos)
 
 	  /* If the default face is remapped or the 'margin' face has a
 	     non-default background, and the window has display margins,
-	     and no glyphs were written yet to the margins on this screen
-	     line, fill the margin area so that the margins use the
-	     correct background.  Placed here, after the if/else-if chain
-	     above, so it fires for all three truncation paths: TTY/no-fringe
-	     truncation glyph, GUI newline-overflow-into-fringe, and GUI
-	     regular truncation where the indicator is drawn as a fringe
-	     bitmap.  */
+	     extend the face in the margin area so that the margins use
+	     the correct background.  This handles all three truncation
+	     paths: TTY/no-fringe truncation glyph, GUI
+	     newline-overflow-into-fringe, and GUI regular truncation
+	     where the indicator is drawn as a fringe bitmap.  */
 	  {
 	    int margin_face_id =
 	      lookup_basic_face (it->w, it->f, MARGIN_FACE_ID);