diff --git a/README.md b/README.md
index b326ce6..af672f9 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,15 @@
 
 **log_tester** is a crate that takes care of capturing log messages produced by the [`log`](https://docs.rs/log) crate during test, and then perform checks on them.
 
+## Warnings
+
+This crate is made to capture all logs, including in multithreaded case.
+Hence, it does not work well with `cargo test`, the logs from all test will be captured.
+
+It is better to use `cargo nextest` instead.
+
+Using `cargo test` will not fail but additional logs will be captured. In that way the test may not be right.
+
 ## Usage
 
 This crate is intend to be used in conjunction with the [`log`](https://docs.rs/log)
@@ -19,7 +28,7 @@ log = "0.4"
 log_tester = "0.1"
 ```
 
-```rust, ignore
+```rust
 use log_tester::LogTester;
 use log::Level;
 
diff --git a/src/lib.rs b/src/lib.rs
index 3c52f81..f70720f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,6 +23,8 @@ use log::{Level, Log, Record};
 /// The list of captured logs.
 static LOGS: RwLock<Vec<CapturedLog>> = RwLock::new(Vec::new());
 
+static INIT: std::sync::Once = std::sync::Once::new();
+
 /// The logger
 pub struct LogTester;
 
@@ -49,7 +51,7 @@ impl LogTester {
     /// LogTester::start();
     /// ```
     pub fn start() {
-        log::set_logger(&LogTester).expect("Failed to start the logger");
+        INIT.call_once(|| log::set_logger(&LogTester).expect("Failed to start the logger"));
         log::set_max_level(log::LevelFilter::Trace);
     }