diff --git a/README.md b/README.md
index 19f6ce2..0211560 100644
--- a/README.md
+++ b/README.md
@@ -51,17 +51,19 @@ Most variables are the same as in the [official postgres image](https://hub.dock
 
 | env variable | description |
 |--|--|
-| POSTGRES_HOST | postgres connection parameter; postgres host to connect to. |
-| POSTGRES_DB | comma or space separated list of postgres databases to backup. |
-| POSTGRES_USER | postgres connection parameter; postgres user to connect with. |
-| POSTGRES_PASSWORD | postgres connection parameter; postgres password to connect with. |
-| POSTGRES_PASSWORD_FILE | alternative to POSTGRES_PASSWORD, useful with docker secrets. |
-| POSTGRES_EXTRA_OPTS | additional options for `pg_dump`. |
-| SCHEDULE | [cron-schedule](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules) specifying the interval between postgres backups. |
-| BACKUP_KEEP_DAYS | number of daily backups to keep before removal. |
-| BACKUP_KEEP_WEEKS | number of weekkly backups to keep before removal. |
-| BACKUP_KEEP_MONTHS | number of monthly backups to keep before removal. |
-| HEALTHCHECK_PORT | Port listening for cron-schedule health check. |
+| BACKUP_DIR | Directory to save the backup at. Defaults to `/backups`. |
+| BACKUP_KEEP_DAYS | Number of daily backups to keep before removal. Defaults to `7`. |
+| BACKUP_KEEP_WEEKS | Number of weekkly backups to keep before removal. Defaults to `4`. |
+| BACKUP_KEEP_MONTHS | Number of monthly backups to keep before removal. Defaults to `6`. |
+| HEALTHCHECK_PORT | Port listening for cron-schedule health check. Defaults to `8080`. |
+| POSTGRES_DB | Comma or space separated list of postgres databases to backup. Required. |
+| POSTGRES_EXTRA_OPTS | Additional options for `pg_dump`. Defaults to `-Z9`. |
+| POSTGRES_HOST | Postgres connection parameter; postgres host to connect to. Required. |
+| POSTGRES_PASSWORD | Postgres connection parameter; postgres password to connect with. Required. |
+| POSTGRES_PASSWORD_FILE | Alternative to POSTGRES_PASSWORD, useful with docker secrets. |
+| POSTGRES_PORT | Postgres connection parameter; postgres port to connect to. Defaults to `5432`. |
+| POSTGRES_USER | Postgres connection parameter; postgres user to connect with. Required. |
+| SCHEDULE | [Cron-schedule](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules) specifying the interval between postgres backups. Defaults to `@daily`. |
 
 ### Manual Backups