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-rw-r--r--lispref/nonascii.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/lispref/nonascii.texi b/lispref/nonascii.texi
index dd0f15c817e..a8f45e9dd20 100644
--- a/lispref/nonascii.texi
+++ b/lispref/nonascii.texi
@@ -1031,6 +1031,9 @@ argument, a list of all arguments passed to
@code{find-operation-coding-system}. It must return a coding system
or a cons cell containing two coding systems. This value has the same
meaning as described above.
+
+If @var{coding} (or what returned by the above function) is
+@code{undecided}, the normal code-detection is performed.
@end defvar
@defvar process-coding-system-alist