--- MAN.20231021	2023-10-27 11:31:29.439226409 -0500
+++ MAN.20231021gbr	2023-10-27 11:05:57.682337667 -0500
@@ -12269,7 +12269,12 @@
 DESCRIPTION
        ncurses provides functions returning properties of a WINDOW structure,
        allowing it to be “opaque” if the application defines the
-       NCURSES_OPAQUE preprocessor symbol.
+       NCURSES_OPAQUE preprocessor symbol.  Opacity in this sense means that
+       the members of struct data types are not directly accessible (for
+       instance, through “.” or “->” operators), but instead must be queried
+       and/or set via library functions.  Advantages of opacity include
+       greater abstraction and improved management of concurrent accesses to
+       data structures, keeping object states coherent.
 
        is_cleared
               returns the value set by clearok(3X).