diff --git a/CLAUDE.md b/CLAUDE.md
index ed7375c..13bd9dc 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -119,3 +119,10 @@
 - Follow the MIDL paper's terminology (e.g. "attenuated plaque",
   "polar coordinate transformation", "CNN-LSTM") for consistency unless a
   term needs to change for the current data/results or a journal audience.
+- Never fill a gap with an unstated inference — don't write claims,
+  numbers, or details the user hasn't given. If something needed for the
+  manuscript is unclear or unspecified, ask rather than guess.
+- When rendering Japanese source material (the thesis, `main_ja.tex`) into
+  English, translate faithfully — not a loose paraphrase — while still
+  producing natural, idiomatic English rather than a stiff word-for-word
+  rendering.