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-rw-r--r--ext/iconv/iconv.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/ext/iconv/iconv.c b/ext/iconv/iconv.c
index 14ef9ae380..f80a553edc 100644
--- a/ext/iconv/iconv.c
+++ b/ext/iconv/iconv.c
@@ -66,6 +66,12 @@
* 4. Shorthand for (3).
*
* Iconv.iconv(to, from, *input.to_a)
+ *
+ * == Attentions
+ *
+ * Even if some extentions of implementation dependent are useful,
+ * DON'T USE those extentions in libraries and scripts to widely distribute.
+ * If you want to use those feature, use String#encode.
*/
/* Invalid value for iconv_t is -1 but 0 for VALUE, I hope VALUE is