diff --git a/src/runtime/src/eh_artiq.rs b/src/runtime/src/eh_artiq.rs
index 797b8382..e7a82824 100644
--- a/src/runtime/src/eh_artiq.rs
+++ b/src/runtime/src/eh_artiq.rs
@@ -405,6 +405,7 @@ extern fn stop_fn(_version: c_int,
     }
 }
 
+// Must be kept in sync with preallocate_runtime_exception_names() in artiq/language/embedding_map.py
 static EXCEPTION_ID_LOOKUP: [(&str, u32); 10] = [
     ("RuntimeError", 0),
     ("RTIOUnderflow", 1),