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-rw-r--r--encoding.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/encoding.c b/encoding.c
index 328e109242..8f09142b9e 100644
--- a/encoding.c
+++ b/encoding.c
@@ -1322,6 +1322,7 @@ set_default_internal(VALUE klass, VALUE encoding)
* Encoding.locale_charmap -> string
*
* Returns the locale charmap name.
+ * It returns nil if no appropriate information.
*
* Debian GNU/Linux
* LANG=C