diff --git a/src/bin/semver-crater.rs b/src/bin/semver-crater.rs
index e5ef2c2d..220d414e 100644
--- a/src/bin/semver-crater.rs
+++ b/src/bin/semver-crater.rs
@@ -88,6 +88,8 @@ fn main() -> anyhow::Result<()> {
     let args = Args::parse();
 
     let client = crates_io_api::SyncClient::new(
+        // The format of the string and the duration
+        // is documented in https://crates.io/policies#crawlers
         "crates_io_api: cargo-semver-checks (https://github.com/obi1kenobi/cargo-semver-checks/)",
         Duration::from_millis(1000),
     )?;