diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index d25be87..375d3fb 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -86,6 +86,24 @@
 		zero, which disables test termination and system shutdown.
 		This capability is useful for automated testing.
 
+stall_cpu	The number of seconds that a CPU should be stalled while
+		within both an rcu_read_lock() and a preempt_disable().
+		This stall happens only once per rcutorture run.
+		If you need multiple stalls, use modprobe and rmmod to
+		repeatedly run rcutorture.  The default for stall_cpu
+		is zero, which prevents rcutorture from stalling a CPU.
+
+		Note that attempts to rmmod rcutorture while the stall
+		is ongoing will hang, so be careful what value you
+		choose for this module parameter!  In addition, too-large
+		values for stall_cpu might well induce failures and
+		warnings in other parts of the kernel.  You have been
+		warned!
+
+stall_cpu_holdoff
+		The number of seconds to wait after rcutorture starts
+		before stalling a CPU.  Defaults to 10 seconds.
+
 stat_interval	The number of seconds between output of torture
 		statistics (via printk()).  Regardless of the interval,
 		statistics are printed when the module is unloaded.