1 files changed, 5 insertions, 1 deletions

diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index ea2d35d64d26..bd365988e8d8 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -655,7 +655,11 @@ explains which is which.
                   read the irq flags variable, an 'X' will always
                   be printed here.
 
-  need-resched: 'N' task need_resched is set, '.' otherwise.
+  need-resched:
+        'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED is set,
+        'n' only TIF_NEED_RESCHED is set,
+        'p' only PREEMPT_NEED_RESCHED is set,
+        '.' otherwise.
 
   hardirq/softirq:
         'H' - hard irq occurred inside a softirq.