document that redu prompts for a password in README.md

README.md

@@ -31,7 +31,7 @@ Note: it currently requires nightly to build.
 # Running
 
 You can specify the repository and the password command in exactly the same ways
-that restic supports, with the exception that redu will not prompt you for the password.
+that restic supports.
 
 For example using environment variables:
 ```
@@ -49,6 +49,9 @@ Note: `--repository-file` (env: `RESTIC_REPOSITORY_FILE`) and `--password-file`
 as well as plain text passwords set via the `RESTIC_PASSWORD` environment variable,
 are supported as well and work just like in restic.
 
+Similar to restic, redu will prompt you to enter the password, if it isn't
+given any other way.
+
 # Usage
 Redu keeps a cache with your file/directory sizes (per repo).
 On each run it will sync the cache with the snapshots in your repo,