diff --git a/docs/ENV-VARS.md b/docs/ENV-VARS.md
index e1037212..9206a40f 100644
--- a/docs/ENV-VARS.md
+++ b/docs/ENV-VARS.md
@@ -6,9 +6,7 @@ starting the app with `cargo run` or write them in a `.env` file to have automat
 Here are the variables that Plume uses:
 
 - `BASE_URL`: the domain name, or IP and port on which Plume is listening. It is used in all federation-related code.
-- `DB_URL`: the URL of the PostgreSQL database, used by Plume (`postgres://plume:plume@localhost/plume` by default).
-- `POSTGRES_USER`: if you just want to use a different PostgreSQL user name, and keep the rest of the default URL.
-- `POSTGRES_PASSWORD`: same as `POSTGRES_USER`, but for the password.
+- `DATABASE_URL`: the URL of the PostgreSQL database, used by Plume (`postgres://plume:plume@localhost/plume` by default with PostgreSQL, `plume.db` with SQlite).
 - `USE_HTTPS`: if it is `0`, federation and medias will be using HTTP by default (`1` by default).
 - `ROCKET_ADDRESS`: the adress on which Plume should listen (`0.0.0.0` by default).
 - `ROCKET_PORT`: the port on which Plume should listen ([`7878` by default](https://twitter.com/ag_dubs/status/852559264510070784))
diff --git a/docs/INSTALL.md b/docs/INSTALL.md
index fcdd57d4..66a62534 100644
--- a/docs/INSTALL.md
+++ b/docs/INSTALL.md
@@ -133,6 +133,31 @@ export FEATURES=postgres
 export FEATURES=sqlite
 ```
 
+## Configuring Plume
+
+Before starting Plume, you'll need to create a configuration file, called `.env`. Here is a sample of what you should put inside.
+
+```bash
+# The address of the database
+# (replace USER, PASSWORD, PORT and DATABASE_NAME with your values)
+#
+# If you are using SQlite, use the path of the database file (`plume.db` for instance)
+DATABASE_URL=postgres://USER:PASSWORD@IP:PORT/DATABASE_NAME
+
+# For PostgreSQL: migrations/postgres
+# For SQlite: migrations/sqlite
+MIGRATION_DIR=migrations/postgres
+
+# The domain on which your instance will be available
+BASE_URL=plu.me
+
+# Secret key used for private cookies and CSRF protection
+# You can generate one with `openssl rand -base64 32`
+ROCKET_SECRET_KEY=
+```
+
+For more information about what you can put in your `.env`, see [the documentation about environment variables](ENV-VARS.md).
+
 ## Running migrations
 
 Migrations are scripts used to update the database. They are run by a tool called Diesel, which can be installed with:
@@ -144,11 +169,7 @@ cargo install diesel_cli --no-default-features --features $FEATURES --version '=
 To run the migrations, you can do:
 
 ```bash
-# For a PostgreSQL database
-diesel migration run --database-url postgres://USER:PASSWORD@IP:PORT/DATABASE_NAME
-
-# For a SQlite database
-diesel migration run --database-url ./plume.sqlite3
+diesel migration run
 ```
 
 Migrations should be run before using Plume or the `plm` CLI tool, and after each update.
@@ -163,25 +184,6 @@ cargo install --no-default-features --features $FEATURES
 cargo install --no-default-features --features $FEATURES --path plume-cli
 ```
 
-Before starting Plume, you'll need to create a configuration file, called `.env`. Here is a sample of what you should put inside.
-
-```bash
-# The address of the database
-# (replace USER, PASSWORD, PORT and DATABASE_NAME with your values)
-#
-# If you are using SQlite, use the path of the database file
-DB_URL=postgres://USER:PASSWORD@IP:PORT/DATABASE_NAME
-
-# The domain on which your instance will be available
-BASE_URL=plu.me
-
-# Secret key used for private cookies and CSRF protection
-# You can generate one with `openssl rand -base64 32`
-ROCKET_SECRET_KEY=
-```
-
-For more information about what you can put in your `.env`, see [the documentation about environment variables](ENV-VARS.md).
-
 After that, you'll need to setup your instance, and the admin's account.
 
 ```
@@ -224,8 +226,8 @@ docker-compose up -d postgres
 docker-compose run --rm plume diesel migration run
 
 # Setup your instance
-docker-compose run --rm plume plume instance new
-docker-compose run --rm plume plume users new --admin
+docker-compose run --rm plume plm instance new
+docker-compose run --rm plume plm users new --admin
 
 # Launch your instance for good
 docker-compose up -d
@@ -489,8 +491,7 @@ exit 0
 ## Caveats:
 
 - Pgbouncer is not supported yet (named transactions are used).
-- Rust nightly is a moving target, dependancies can break and sometimes you need to check a few versions to find the one working (run `rustup override set nightly-2018-05-15` or `rustup override set nightly-2018-05-31` in the Plume directory if you have issues during the compilation)
-- Rust nightly 2018-06-28 is known to be failing to compile diesel 1.3.2
+- Rust nightly is a moving target, dependancies can break and sometimes you need to check a few versions to find the one working (run `rustup override set nightly-2018-07-17` in the Plume directory if you have issues during the compilation)
 
 ## Acknowledgements
 
diff --git a/docs/UPDATE.md b/docs/UPDATE.md
index 7c387182..4826e8a6 100644
--- a/docs/UPDATE.md
+++ b/docs/UPDATE.md
@@ -7,7 +7,7 @@ git pull origin master
 cargo install --force && cargo install --path plume-cli --force
 
 # Run the migrations
-diesel migration run --database-url 'YOUR_DB_URL'
+diesel migration run
 
 # If you are using sysvinit
 sudo service plume restart
diff --git a/docs/docker.sample.env b/docs/docker.sample.env
index 33ae4f49..b9514150 100644
--- a/docs/docker.sample.env
+++ b/docs/docker.sample.env
@@ -3,10 +3,8 @@ BASE_URL=yourdomain.com
 ROCKET_SECRET_KEY=randomstringhere
 
 # you can safely leave those defaults
-POSTGRES_USER=plume
-POSTGRES_PASSWORD=plume
-DB_URL=postgres://plume:plume@postgres:5432/plume
 DATABASE_URL=postgres://plume:plume@postgres:5432/plume
+MIGRATION_DIR=postgres
 USE_HTTPS=1
 ROCKET_ADDRESS=0.0.0.0
 ROCKET_PORT=7878
diff --git a/plume-cli/src/main.rs b/plume-cli/src/main.rs
index 8243f744..d44b4c13 100644
--- a/plume-cli/src/main.rs
+++ b/plume-cli/src/main.rs
@@ -7,7 +7,7 @@ extern crate rpassword;
 use clap::App;
 use diesel::Connection;
 use std::io::{self, prelude::*};
-use plume_models::{DB_URL, Connection as Conn};
+use plume_models::{DATABASE_URL, Connection as Conn};
 
 mod instance;
 mod users;
@@ -22,7 +22,7 @@ fn main() {
     let matches = app.clone().get_matches();
 
     dotenv::dotenv().ok();
-    let conn = Conn::establish(DB_URL.as_str());
+    let conn = Conn::establish(DATABASE_URL.as_str());
 
     match matches.subcommand() {
         ("instance", Some(args)) => instance::run(args, &conn.expect("Couldn't connect to the database.")),
diff --git a/plume-models/src/lib.rs b/plume-models/src/lib.rs
index 775c8edc..273674ff 100644
--- a/plume-models/src/lib.rs
+++ b/plume-models/src/lib.rs
@@ -191,12 +191,19 @@ lazy_static! {
     pub static ref BASE_URL: String = env::var("BASE_URL")
         .unwrap_or(format!("127.0.0.1:{}", env::var("ROCKET_PORT").unwrap_or(String::from("8000"))));
 
-    pub static ref DB_URL: String = env::var("DB_URL")
-        .unwrap_or(format!("postgres://plume:plume@localhost/{}", env::var("DB_NAME").unwrap_or(String::from("plume"))));
-
     pub static ref USE_HTTPS: bool = env::var("USE_HTTPS").map(|val| val == "1").unwrap_or(true);
 }
 
+#[cfg(all(feature = "postgres", not(feature = "sqlite")))]
+lazy_static! {
+    pub static ref DATABASE_URL: String = env::var("DATABASE_URL").unwrap_or(String::from("postgres://plume:plume@localhost/plume"));
+}
+
+#[cfg(all(feature = "sqlite", not(feature = "postgres")))]
+lazy_static! {
+    pub static ref DATABASE_URL: String = env::var("DATABASE_URL").unwrap_or(String::from("plume.sqlite"));
+}
+
 pub fn ap_url(url: String) -> String {
     let scheme = if *USE_HTTPS {
         "https"
diff --git a/src/main.rs b/src/main.rs
index 802b7cf4..41b9a6cd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -38,7 +38,7 @@ use diesel::r2d2::ConnectionManager;
 use rocket::State;
 use rocket_contrib::Template;
 use rocket_csrf::CsrfFairingBuilder;
-use plume_models::{DB_URL, Connection, db_conn::DbPool};
+use plume_models::{DATABASE_URL, Connection, db_conn::DbPool};
 use workerpool::{Pool, thunk::ThunkWorker};
 
 mod api;
@@ -51,7 +51,7 @@ type Worker<'a> = State<'a, Pool<ThunkWorker<()>>>;
 fn init_pool() -> Option<DbPool> {
     dotenv::dotenv().ok();
 
-    let manager = ConnectionManager::<Connection>::new(DB_URL.as_str());
+    let manager = ConnectionManager::<Connection>::new(DATABASE_URL.as_str());
     DbPool::new(manager).ok()
 }