diff --git a/docs/curl.1 b/docs/curl.1
index f5f9297fdea2a561769d9dc2269b7d9ccc98c0df..825e6fef597f7ef2aa7a30c74eca4a9b86cf7852 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -846,6 +846,8 @@ This curl uses asynchronous name resolves.
 SPNEGO Negotiate authenticaion is supported.
 .IP "Largefile"
 This curl supports transfers of large files, files larger than 2GB.
+.IP "IDN"
+This curl supports IDN - international domain names.
 .RE
 .IP "-w/--write-out <format>"
 Defines what to display after a completed and successful operation. The format