diff --git a/crates/bevy_ecs/src/event.rs b/crates/bevy_ecs/src/event.rs
index 63a88d175954d0..056262cc62843a 100644
--- a/crates/bevy_ecs/src/event.rs
+++ b/crates/bevy_ecs/src/event.rs
@@ -286,6 +286,7 @@ impl<'w, 's, T: Resource> EventReader<'w, 's, T> {
 
     /// Determines if there are any events available to be read without consuming any.
     /// If you need to consume the iterator you can use [`EventReader::any`]
+    /// WARNING: `events.is_empty()` is not the same as doing `!events.any()`
     pub fn is_empty(&self) -> bool {
         self.len() == 0
     }