From 1a2c433764204f9f23eff696b45badbc26e5875a Mon Sep 17 00:00:00 2001
From: Matthew Pickering <matthewtpickering@gmail.com>
Date: Wed, 29 May 2019 17:15:48 +0100
Subject: Eventlog: Document the fact timestamps are nanoseconds

[skip ci]
---
 docs/users_guide/runtime_control.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/users_guide/runtime_control.rst b/docs/users_guide/runtime_control.rst
index 0048a51837..c573576972 100644
--- a/docs/users_guide/runtime_control.rst
+++ b/docs/users_guide/runtime_control.rst
@@ -1095,6 +1095,10 @@ When the program is linked with the :ghc-flag:`-eventlog` option
     `ghc-events <http://hackage.haskell.org/package/ghc-events>`__
     package.
 
+    Each event is associated with a timestamp which is the number of
+    nanoseconds since the start of executation of the running program.
+    This is the elapsed time, not the CPU time.
+
 .. rts-flag:: -ol ⟨filename⟩
 
     :default: :file:`<program>.eventlog`
-- 
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