diff --git a/libafl/src/observers/stacktrace.rs b/libafl/src/observers/stacktrace.rs
index dacc00f5c8..8480a48caa 100644
--- a/libafl/src/observers/stacktrace.rs
+++ b/libafl/src/observers/stacktrace.rs
@@ -267,7 +267,7 @@ pub fn get_asan_runtime_flags() -> String {
     flags.join(":")
 }
 
-/// An observer looking at the backtrace of target command using ASAN output
+/// An observer looking at the backtrace of target command using ASAN output. This observer is only compatible with a `ForkserverExecutor`.
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct AsanBacktraceObserver {
     observer_name: Cow<'static, str>,