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-rw-r--r--otherlibs/unix/unix.mli3
1 files changed, 2 insertions, 1 deletions
diff --git a/otherlibs/unix/unix.mli b/otherlibs/unix/unix.mli
index 386864e05..251c31ae3 100644
--- a/otherlibs/unix/unix.mli
+++ b/otherlibs/unix/unix.mli
@@ -910,7 +910,8 @@ type socket_domain =
PF_UNIX (** Unix domain *)
| PF_INET (** Internet domain (IPv4) *)
| PF_INET6 (** Internet domain (IPv6) *)
-(** The type of socket domains. *)
+(** The type of socket domains. Not all platforms support
+ IPv6 sockets (type [PF_INET6]). *)
type socket_type =
SOCK_STREAM (** Stream socket *)