diff --git a/docs/usersguide.htm b/docs/usersguide.htm
index d20efad1..1e66808c 100644
--- a/docs/usersguide.htm
+++ b/docs/usersguide.htm
@@ -1231,11 +1231,34 @@ longitude = -77.0366</pre>
     <p>Set to the station model. For example, WMR200 or WMR200A.</p>
     <p class="config_option">use_pc_time</p>
     <p>If True, use the computer time, otherwise use the station time.  Default
-      is False.</p>
+      is True.</p>
+    <p class="config_option">archive_interval</p>
+    <p>Set the wmr200 archive interval in seconds.  Default is 60 seconds.</p>
+    <p>The wmr200 hardware records archive data at an immutable rate of 60
+      seconds. This field may be set to a higher value enabling the weewx
+      engine to coalesce live data packets.  However, when the wmr200 is not
+      connected to a system via USB or if the weewx software is not running,
+      the wmr200 console will continue to store weather data in onboard
+      console memory at a fixed rate of 60 seconds.</p>
+    <p class="config_option">erase_archive</p>
+    <p>If True, erase onboard console memory archive on startup.  Default is
+      False.</p>
+    <p class="config_option">archive_startup</p>
+    <p>When retrieving archive data packets from the wmr200 onboard console
+      memory, there is no explicit indication that all the data has been
+      drained.  This field specifies when to transition from archive mode to
+      live mode.  This transition occurs when no archive packets are detected
+      within this time interval. Default is 120 seconds.<p>
+    <p class="config_option">archive_threshold</p>
+    <p>Occasionally when retrieving archive packets from the wmr200 onboard
+      memory a stale data packet will be detected.  The archive packets are
+      presented in sequential order typically timestamped 60 seconds apart.
+      However, there is no guarantee the archive packets are exactly 60
+      seconds apart.  Should an incoming archive data packet timestamp exceed
+      the previous archive data packet one by the amount in this field it will
+      be dropped. Default is 1512000 seconds (1 week).</p>
     <p class="config_option">sensor_status</p>
     <p>If True, emit sensor faults and failures to log.  Default is True.</p>
-    <p class="config_option">erase_archive</p>
-    <p>If True, erase station archive on startup.  Default is False.</p>
 
     <h3 class="config_section">[WMR9x8]</h3>
     <p>This section is for options relating to the Oregon Scientific WMR-918/968