Document fill-separate-heterogeneous-words-with-space (bug#25685)

* doc/lispref/text.texi (Filling):
Document fill-separate-heterogeneous-words-with-space (bug#25685).

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index 438c67be89bbc760add1a8bf4eae8fd33c79a104..9696c73c48485b238c0f9f2472cd1b1b567d5ba6 100644 (file)
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -1649,6 +1649,13 @@ If this variable is non-@code{nil}, it should be a string of
 characters that can end a sentence without following spaces.
 @end defopt
 
+@defopt fill-separate-heterogeneous-words-with-space
+If this variable is non-@code{nil}, two words of different kind (e.g.,
+English and CJK) will be separated with a space when concatenating one
+that is in the end of a line and the other that is in the beginning of
+the next line for filling.
+@end defopt
+
 @defvar fill-paragraph-function
 This variable provides a way to override the filling of paragraphs.
 If its value is non-@code{nil}, @code{fill-paragraph} calls this