diff --git a/crates/voicevox_core/src/__internal.rs b/crates/voicevox_core/src/__internal.rs
index aea13e648..c37f50601 100644
--- a/crates/voicevox_core/src/__internal.rs
+++ b/crates/voicevox_core/src/__internal.rs
@@ -1,3 +1,5 @@
+// FIXME: 要議論: https://github.com/VOICEVOX/voicevox_core/issues/595
+
 use std::fmt::Display;
 
 pub fn to_zenkaku(surface: &str) -> String {