Update docs

[infoex-autowx.git] / README.md

diff --git a/README.md b/README.md
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+++ b/README.md
@@ -233,6 +233,17 @@ which makes it into your operation is inaccurate, start your
 investigation with time zone-related issues and move on only once you've
 ruled this out as a cause of the inaccuracy.
 
+Unit conversions
+----------------
+
+Desired units may be specified in the configuration file.
+
+For MesoWest, the desired unit will be passed along in the API request
+and the conversion will take place through the MesoWest/Synoptic API.
+
+For NRCS, this program will do the conversion manually, as NRCS does not
+permit specifying the desired unit.
+
 A note on supported measurements
 --------------------------------