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-rw-r--r--Documentation/btrfs-send.asciidoc1
-rw-r--r--cmds-send.c1
2 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/btrfs-send.asciidoc b/Documentation/btrfs-send.asciidoc
index 1dba8a3d..e05342ff 100644
--- a/Documentation/btrfs-send.asciidoc
+++ b/Documentation/btrfs-send.asciidoc
@@ -12,6 +12,7 @@ SYNOPSIS
DESCRIPTION
-----------
Sends the subvolume(s) specified by <subvol> to stdout.
+<subvol> should be read-only here.
By default, this will send the whole subvolume. To do an incremental
send, use '-p <parent>'.
diff --git a/cmds-send.c b/cmds-send.c
index 478ace1f..3e34d75b 100644
--- a/cmds-send.c
+++ b/cmds-send.c
@@ -711,6 +711,7 @@ const char * const cmd_send_usage[] = {
"btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>] <subvol> [<subvol>...]",
"Send the subvolume(s) to stdout.",
"Sends the subvolume(s) specified by <subvol> to stdout.",
+ "<subvol> should be read-only here.",
"By default, this will send the whole subvolume. To do an incremental",
"send, use '-p <parent>'. If you want to allow btrfs to clone from",
"any additional local snapshots, use '-c <clone-src>' (multiple times",