From 20e75858d4c1e971b6b577fdf3b97b3005fc8328 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Wed, 2 Jul 2014 07:17:45 -0700
Subject: * txr.1: Documented usleep.

---
 ChangeLog |  4 ++++
 txr.1     | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 9745e5f7..7da494e0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2014-07-02  Kaz Kylheku  <kaz@kylheku.com>
+
+	* txr.1: Documented usleep.
+
 2014-07-02  Kaz Kylheku  <kaz@kylheku.com>
 
 	* eval.c (dwim_loc): Support indexing using a list of positions,
diff --git a/txr.1 b/txr.1
index 53557fa6..801c5f5f 100644
--- a/txr.1
+++ b/txr.1
@@ -13828,6 +13828,27 @@ EXIT_FAILURE, and t corresponds to EXIT_SUCCESS. These are platform-independent
 indicators of failed or successful termination. The numeric value 0 also
 indicates success.
 
+.SS Function usleep
+
+.TP
+Syntax:
+
+  (usleep <usec>)
+
+.TP
+Description:
+
+The usleep function suspends the execution of the program for at least
+<usec> microseconds.
+
+The return value is t if the sleep was successfully executed. A nil
+value indicates premature wakup or complete failure.
+
+Note: the actual sleep resolution is not guaranteed, and depends on granularity
+of the system timer.  Actual sleep times may be rounded up to the nearest 10
+millisecond multiple on a system where timed suspensions are triggered by a 100
+Hz tick.
+
 .SS Function mkdir
 
 .TP
-- 
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