Update reference_guide.md

mwesolowski · Apr 19, 2019 · 1bbfdb6 · 1bbfdb6
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diff --git a/docs/reference_guide.md b/docs/reference_guide.md
@@ -1244,7 +1244,7 @@ Normal output from a BPF program is either:
 
 ### 1. perf_buffer_poll()
 
-Syntax: ```BPF.perf_buffer_poll([timeout])```
+Syntax: ```BPF.perf_buffer_poll(timeout=T)```
 
 This polls from all open perf ring buffers, calling the callback function that was provided when calling open_perf_buffer for each entry.