diff --git a/bindings/matrix-sdk-crypto-js/src/device.rs b/bindings/matrix-sdk-crypto-js/src/device.rs
index 35d07b7ec..0fe24e210 100644
--- a/bindings/matrix-sdk-crypto-js/src/device.rs
+++ b/bindings/matrix-sdk-crypto-js/src/device.rs
@@ -190,7 +190,8 @@ impl Device {
         self.inner.is_deleted()
     }
 
-    /// Is the device deleted?
+    /// Timestamp representing the first time this device has been seen (in
+    /// milliseconds).
     #[wasm_bindgen(js_name = "firstTimeSeen")]
     pub fn first_time_seen(&self) -> u64 {
         self.inner.first_time_seen_ts().0.into()
diff --git a/crates/matrix-sdk-crypto/src/identities/device.rs b/crates/matrix-sdk-crypto/src/identities/device.rs
index 8e407c04b..d8e43dcbf 100644
--- a/crates/matrix-sdk-crypto/src/identities/device.rs
+++ b/crates/matrix-sdk-crypto/src/identities/device.rs
@@ -988,7 +988,6 @@ pub(crate) mod testing {
 
 #[cfg(test)]
 pub(crate) mod tests {
-
     use ruma::{user_id, MilliSecondsSinceUnixEpoch};
     use vodozemac::{Curve25519PublicKey, Ed25519PublicKey};