diff --git a/postgres.md b/postgres.md
index c13afba..80ab6c8 100644
--- a/postgres.md
+++ b/postgres.md
@@ -10,25 +10,25 @@ docker pull postgresql:10-alpine
 
 # define environment variables
 cat << EOF > POSTGRESENV
-POSTGRES_USER=""
-POSTGRES_PASSWORD=""
-POSTGRES_DB=""
+POSTGRES_USER=
+POSTGRES_PASSWORD=
+POSTGRES_DB=
 EOF
 
 # define container name and ports
-PGSRV=""
-PGSRVPORT=""
+PGSRV=
+PGSRVPORT=
 
 docker run -d --name ${PGSRV} --env-file POSTGRESENV -p ${PGSRVPORT}:5432 postgres:10-alpine
 
 # specify container name for psql configuration, if needed
-PGCLI=""
+PGCLI=
 docker run -d --name ${PGCLI} postgres:10-alpine
 
 # connect using client container, enter password when prompted
-PGUSER=""
-PGDB=""
-PGHOST=""
-PGPORT=""
+PGUSER=
+PGDB=
+PGHOST=
+PGPORT=
 docker exec -it ${PGCLI} psql -h ${PGHOST} -p ${PGPORT} -U ${PGUSER} -W -d ${PGDB}
 ```