Add default timeout docs also on lib.rs

README.md

@@ -235,9 +235,9 @@ In this case test pass because the delay is just 10 milliseconds and timeout is
 
 You can use `timeout` attribute like any other attibute in your tests and you can
 override a group timeout with a case specific one. In the follow example we have
-3 tests where first and third use 100 millis but the second one use 10 millis. 
+3 tests where first and third use 100 millis but the second one use 10 millis.
 Another valuable point in this example is to use an expression to compute the
-duration. 
+duration.
 
 ```rust
 fn ms(ms: u32) -> Duration {

rstest_macros/src/lib.rs

@@ -753,13 +753,18 @@ pub fn fixture(
 ///     assert_eq!(expected, base.await / div);
 /// }
 /// ```
+/// 
+/// ### Default timeout
+/// 
+/// You can set a default timeout for test using the `RSTEST_TIMEOUT` environment variable.
+/// The value is in seconds and is evaluated on test compile time.///
 ///
 /// ### Test `#[timeout()]`
 ///
 /// You can define an execution timeout for your tests with `#[timeout(<duration>)]` attribute. Timeouts
 /// works both for sync and async tests and is runtime agnostic. `#[timeout(<duration>)]` take an
 /// expression that should return a `std::time::Duration`. Follow a simple async example:
-///
+/// 
 /// ```rust
 /// use rstest::*;
 /// use std::time::Duration;