diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 763a8be7ce9..09022883f71 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -3538,6 +3538,11 @@ attributes, Emacs applies the face attributes of the ``underlying''
 buffer text.  Note that this is so even if the overlay or display
 string is displayed in the display margins (@pxref{Display Margins}).
 
+@item
+If the text is to be shown in the display margins, and any given
+attribute has not been specified during the preceding steps, Emacs
+applies the attribute of the @code{margin} face.
+
 @item
 If any given attribute has not been specified during the preceding
 steps, Emacs applies the attribute of the @code{default} face.