Improve documentation of last change.

* etc/NEWS: Mention the string value of 'auto-composition-mode'.

* src/composite.c (syms_of_composite) <auto-composition-mode>: Doc
fix.

2 files changed, 11 insertions, 2 deletions

diff --git a/etc/NEWS b/etc/NEWS
index f77fc8243f7..cc779b40f45 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -134,6 +134,15 @@ file:
 It used to be enabled when Emacs is started in GUI mode but not when started
 in text mode.  The cursor still only actually blinks in GUI frames.
 
+---
+** 'auto-composition-mode' can now be selectively disabled on some TTYs.
+Some text-mode terminals produce display glitches trying to compose
+characters.  The 'auto-composition-mode' can now have a string value
+that names a terminal type; if the value returned by the 'tty-type'
+function compares equal with that string, automatic composition will
+be disabled in windows shown on that terminal.  The Linux terminal
+sets this up by default.
+
 +++
 ** Etags now supports the Mercury programming language.
 See https://mercurylang.org.
diff --git a/src/composite.c b/src/composite.c
index 2bde14776f3..e97f8e2b4cd 100644
--- a/src/composite.c
+++ b/src/composite.c
@@ -2059,8 +2059,8 @@ The default value is the function `compose-chars-after'.  */);
 	       doc: /* Non-nil if Auto-Composition mode is enabled.
 Use the command `auto-composition-mode' to change this variable.
 
-If this variable is a string, `auto-composition-mode' will be disabled
-in buffers that have a terminal type that equals this string.*/);
+If this variable is a string, `auto-composition-mode' will be disabled in
+buffers displayed on a terminal whose type compares equal to this string.  */);
   Vauto_composition_mode = Qt;
 
   DEFVAR_LISP ("auto-composition-function", Vauto_composition_function,