diff --git a/man/display.texi b/man/display.texi
index 55b3b976308..01b0291e5e8 100644
--- a/man/display.texi
+++ b/man/display.texi
@@ -914,7 +914,9 @@ them), otherwise as escape sequences.  @xref{Single-Byte Character
 Support}.
 
 @vindex show-nonbreak-escape
-  Some character sets define ``non-breaking'' versions of the space
+@cindex no-break space, display
+@cindex no-break hyphen, display
+  Some character sets define ``no-break'' versions of the space
 and hyphen characters, which are used where a line should not be
 broken.  Emacs displays these with an escape character in order to
 distinguish them from ordinary spaces and hyphens.  For example, a