diff --git a/postgres-backup-s3/README.md b/postgres-backup-s3/README.md
index a19abb9..0e73f69 100644
--- a/postgres-backup-s3/README.md
+++ b/postgres-backup-s3/README.md
@@ -47,7 +47,7 @@ More information about the scheduling can be found [here](http://godoc.org/githu
 ### Backup File Name / Path
 By default, if `POSTGRES_BACKUP_ALL` is true, the dump file will be put at `<S3_PREFIX=''>/all_<timestamp>.sql.gz`. When using `POSTGRES_DATABASE`, each database listed will be backed up to the object path `<S3_PREFIX=''>/<database>_<timestamp>.sql.gz`.
 
-If you wish to make these filenames static, you can use the `S3_FILE_NAME` variable, which will change these formats to `<S3_PREFIX>/<S3_FILE_NAME>.sql.gz` or `<S3_PREFIX>/<S3_FILE_NAME>_<database>.sql.gz` accordingly.
+If you wish to make these filenames static, you can use the `S3_FILE_NAME` variable, which will change these formats to `<S3_PREFIX=''>/<S3_FILE_NAME>.sql.gz` or `<S3_PREFIX=''>/<S3_FILE_NAME>_<database>.sql.gz` accordingly.
 
 ### Backup All Databases