diff --git a/bin/weewx/units.py b/bin/weewx/units.py
index 62c28d49..a4ad7d70 100644
--- a/bin/weewx/units.py
+++ b/bin/weewx/units.py
@@ -171,6 +171,7 @@ obs_group_dict = ListOfDicts({
     "soilTemp3"          : "group_temperature",
     "soilTemp4"          : "group_temperature",
     "windchill"          : "group_temperature",
+    "THSW"               : "group_temperature",
     "dateTime"           : "group_time",
     "stormStart"         : "group_time",
     "UV"                 : "group_uv",
diff --git a/docs/customizing.htm b/docs/customizing.htm
index c7b47cd6..c9664e32 100644
--- a/docs/customizing.htm
+++ b/docs/customizing.htm
@@ -6828,7 +6828,7 @@ growing_base = 50.0, degree_F</pre>
                 <td class="first_col">group_temperature</td>
                 <td>appTemp <br/> dewpoint <br/> extraTemp1 <br/> extraTemp2 <br/> extraTemp3 <br/> heatindex <br/>
                     heatingTemp <br/> humidex <br/> inTemp <br/> leafTemp1 <br/> leafTemp2 <br/> outTemp <br/> soilTemp1
-                    <br/> soilTemp2 <br/> soilTemp3 <br/> soilTemp4 <br/> windchill
+                    <br/> soilTemp2 <br/> soilTemp3 <br/> soilTemp4 <br/> windchill <br/> THSW
                 </td>
                 <td>degree_F <br/> degree_C
                 </td>