From e76a7c7126deecb87ddf2d1cbcc7881b9a941b22 Mon Sep 17 00:00:00 2001
From: Ashley Davies <ashley@davies.me.uk>
Date: Thu, 18 Apr 2019 17:29:33 +0100
Subject: [PATCH] Add timeout to perf_buffer_poll docs

---
 docs/reference_guide.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docs/reference_guide.md b/docs/reference_guide.md
index 1eb46995ec83..07ff4cb12265 100644
--- a/docs/reference_guide.md
+++ b/docs/reference_guide.md
@@ -1244,10 +1244,12 @@ Normal output from a BPF program is either:
 
 ### 1. perf_buffer_poll()
 
-Syntax: ```BPF.perf_buffer_poll()```
+Syntax: ```BPF.perf_buffer_poll([timeout])```
 
 This polls from all open perf ring buffers, calling the callback function that was provided when calling open_perf_buffer for each entry.
 
+The timeout parameter is optional and measured in milliseconds.
+
 Example:
 
 ```Python