diff --git a/src/eval/nnue/features/half_kp.cpp b/src/eval/nnue/features/half_kp.cpp
index 72156c82..cba2c9cd 100644
--- a/src/eval/nnue/features/half_kp.cpp
+++ b/src/eval/nnue/features/half_kp.cpp
@@ -35,7 +35,7 @@ inline void HalfKP<AssociatedKing>::GetPieces(
 template <Side AssociatedKing>
 void HalfKP<AssociatedKing>::AppendActiveIndices(
     const Position& pos, Color perspective, IndexList* active) {
-  // コンパイラの警告を回避するため、配列サイズが小さい場合は何もしない
+  // do nothing if array size is small to avoid compiler warning
   if (RawFeatures::kMaxActiveDimensions < kMaxActiveDimensions) return;
 
   BonaPiece* pieces;
diff --git a/src/movegen.h b/src/movegen.h
index 838541f1..d5f82f16 100644
--- a/src/movegen.h
+++ b/src/movegen.h
@@ -68,7 +68,7 @@ struct MoveList {
     return std::find(begin(), end(), move) != end();
   }
 
-  // i�Ԗڂ̗v�f��Ԃ�
+  // returns the i th element
   const ExtMove at(size_t i) const { assert(0 <= i && i < size()); return begin()[i]; }
 
 private: