diff --git a/Doc/library/curses.rst b/Doc/library/curses.rst
index c86ca5d..0b687db 100644
--- a/Doc/library/curses.rst
+++ b/Doc/library/curses.rst
@@ -242,6 +242,15 @@
 
    Return ``True`` if the terminal can display colors; otherwise, return ``False``.
 
+.. function:: has_extended_color_support()
+
+   Return ``True`` if the module supports extended colors; otherwise, return
+   ``False``. Extended color support allows more than 256 color pairs for
+   terminals that support more than 16 colors (e.g. xterm-256color).
+
+   Extended color support requires ncurses version 6.1 or later.
+
+   .. versionadded:: 3.10
 
 .. function:: has_ic()