diff --git a/README.md b/README.md
index 9bcdde1..ea8ccaf 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ of the notes even if it tried to.
| Variable | Default | Description |
| ---------------- | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `REDIS` | `redis://redis/` | Redis URL to connect to. |
+| `REDIS` | `redis://redis/` | Redis URL to connect to. [According to format](https://docs.rs/redis/latest/redis/#connection-parameters) |
| `SIZE_LIMIT` | `1 KiB` | Max size for body. Accepted values according to [byte-unit](https://docs.rs/byte-unit/).
`512 MiB` is the maximum allowed.
The frontend will show that number including the ~35% encoding overhead. |
| `MAX_VIEWS` | `100` | Maximal number of views. |
| `MAX_EXPIRATION` | `360` | Maximal expiration in minutes. |