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-rw-r--r--src/coding.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/coding.c b/src/coding.c
index 3f11c6f41fb..d6d8bb342d6 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -6385,7 +6385,7 @@ DEFUN ("check-coding-system", Fcheck_coding_system, Scheck_coding_system,
1, 1, 0,
doc: /* Check validity of CODING-SYSTEM.
If valid, return CODING-SYSTEM, else signal a `coding-system-error' error.
-It is valid if it is a symbol with a non-nil `coding-system' property.
+It is valid if it is nil or a symbol with a non-nil `coding-system' property.
The value of property should be a vector of length 5. */)
(coding_system)
Lisp_Object coding_system;