fix for statechecker

.env

@@ -35,6 +35,9 @@
 # Put these in .env.production or .env.development to define your dev/prod
 # databases. Do not define it in .env or .env.local! It will be taken as your
 # test database too, and rails will wipe it if you run the test suite.
+# 
+# If you are connecting to PostgreSQL via socket, omit the hostname (e.g.
+# postgresql:///danbooru2)
 # export DATABASE_URL="postgresql://localhost/danbooru2"
 # export ARCHIVE_DATABASE_URL="postgresql://localhost/archive_development"
 # export RO_DATABASE_URL="$DATABASE_URL"