diff --git a/README.md b/README.md
index db043b2..af5dd99 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,15 @@ following in your crontab.
 DSS_ROOT=/path/to/dss
   55  *    *    *    *  cd $DSS_ROOT && bin/articles-update
 ```
+
+## Environment Variables
+
+### PATH
+
+Make sure your `PATH` includes `node_modules/.bin`.  Running `micro-dev` probably won't work otherwise.
+
+### DSS\_DB
+
+By default, this code assumes the database is at `./main.db` in the root 
+of the project directory.  If you want to use another database, you may
+specify its full path in `DSS_DB`.