2 files changed, 19 insertions, 1 deletions
diff --git a/usr/src/man/man1m/zfs-program.1m b/usr/src/man/man1m/zfs-program.1m
index be42dae84b..abd93a5a73 100644
--- a/usr/src/man/man1m/zfs-program.1m
+++ b/usr/src/man/man1m/zfs-program.1m
@@ -18,6 +18,7 @@
 .Nd executes ZFS channel programs
 .Sh SYNOPSIS
 .Cm "zfs program"
+.Op Fl n
 .Op Fl t Ar instruction-limit
 .Op Fl m Ar memory-limit
 .Ar pool
@@ -45,6 +46,14 @@ will be run on
 and any attempts to access or modify other pools will cause an error.
 .Sh OPTIONS
 .Bl -tag -width "-t"
+.It Fl n
+Executes a read-only channel program, which runs faster.
+The program cannot change on-disk state by calling functions from the
+zfs.sync submodule.
+The program can be used to gather information such as properties and
+determining if changes would succeed (zfs.check.*).
+Without this flag, all pending changes must be synced to disk before a
+channel program can complete.
 .It Fl t Ar instruction-limit
 Execution time limit, in number of Lua instructions to execute.
 If a channel program executes more than the specified number of instructions,
diff --git a/usr/src/man/man1m/zfs.1m b/usr/src/man/man1m/zfs.1m
index 8f3643995b..6f138940b2 100644
--- a/usr/src/man/man1m/zfs.1m
+++ b/usr/src/man/man1m/zfs.1m
@@ -267,6 +267,7 @@
 .Ar snapshot Ar snapshot Ns | Ns Ar filesystem
 .Nm
 .Cm program
+.Op Fl n
 .Op Fl t Ar timeout
 .Op Fl m Ar memory_limit
 .Ar pool script
@@ -3408,6 +3409,7 @@ Display the path's inode change time as the first column of output.
 .It Xo
 .Nm
 .Cm program
+.Op Fl n
 .Op Fl t Ar timeout
 .Op Fl m Ar memory_limit
 .Ar pool script
@@ -3427,8 +3429,15 @@ Channel programs may only be run with root privileges.
 .sp
 For full documentation of the ZFS channel program interface, see the manual
 page for
-.Xr zfs-program 1M .
 .Bl -tag -width ""
+.It Fl n
+Executes a read-only channel program, which runs faster.
+The program cannot change on-disk state by calling functions from
+the zfs.sync submodule.
+The program can be used to gather information such as properties and
+determining if changes would succeed (zfs.check.*).
+Without this flag, all pending changes must be synced to disk before
+a channel program can complete.
 .It Fl t Ar timeout
 Execution time limit, in milliseconds.
 If a channel program executes for longer than the provided timeout, it will