diff --git a/waku/src/events/mod.rs b/waku/src/events/mod.rs
index 4f62d13..1d859d1 100644
--- a/waku/src/events/mod.rs
+++ b/waku/src/events/mod.rs
@@ -44,15 +44,17 @@ impl WakuMessageEvent {
     }
 }
 
+/// Register callback to act as event handler and receive application signals,
+/// which are used to react to asynchronous events in Waku
 pub fn waku_set_event_callback<F: FnMut(Signal)>(mut callback: F) {
-    let mut callback = move |data: *const c_char| {
+    let mut callback_wrapper = move |data: *const c_char| {
         let raw_response = unsafe { CStr::from_ptr(data) }
             .to_str()
             .expect("Not null ptr");
         let data: Signal = serde_json::from_str(raw_response).expect("Parsing signal to succeed");
         callback(data);
     };
-    let mut callback_ptr: &mut dyn FnMut(*const c_char) = &mut callback;
+    let mut callback_ptr: &mut dyn FnMut(*const c_char) = &mut callback_wrapper;
     unsafe {
         waku_sys::waku_set_event_callback(&mut callback_ptr as *mut &mut _ as *mut std::ffi::c_void)
     };
@@ -65,6 +67,6 @@ mod tests {
     // TODO: how to actually send a signal and check if the callback is run?
     #[test]
     fn set_event_callback() {
-        waku_set_event_callback(|signal| {});
+        waku_set_event_callback(|_signal| {});
     }
 }