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-rw-r--r--src/coding.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/coding.c b/src/coding.c
index 9cd493ab06..6a3868b016 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -7819,7 +7819,10 @@ updated by the functions `make-coding-system' and
On detecting a coding system, Emacs tries code detection algorithms
associated with each coding-category one by one in this order. When
one algorithm agrees with a byte sequence of source text, the coding
-system bound to the corresponding coding-category is selected. */);
+system bound to the corresponding coding-category is selected.
+
+When you modify this variable, `update-coding-systems-internal' must
+be called. */);
{
int i;