diff --git a/src/board_state.rs b/src/board_state.rs
index 30c7788..bd41860 100644
--- a/src/board_state.rs
+++ b/src/board_state.rs
@@ -2,7 +2,7 @@ use crate::api_types::{Color, Coordinates, File, Move, Piece, PieceKind, Rank};
 use std::collections::HashMap;
 
 #[derive(Clone, Debug)]
-struct ColorState {
+struct CastleState {
     can_king_castle: bool,
     can_queen_castle: bool,
 }
@@ -14,14 +14,14 @@ struct PieceState {
 
 struct SideEffects {
     en_passant: Option<(Coordinates, Color)>,
-    color_state: ColorState,
+    color_state: CastleState,
 }
 
 #[derive(Clone, Debug, Default)]
 pub(crate) struct BoardState {
     inner: HashMap<Coordinates, PieceState>,
-    white_state: ColorState,
-    black_state: ColorState,
+    white_state: CastleState,
+    black_state: CastleState,
     en_passant: Option<(Coordinates, Color)>,
 }
 
@@ -227,7 +227,7 @@ impl PieceState {
     }
 }
 
-impl Default for ColorState {
+impl Default for CastleState {
     fn default() -> Self {
         Self {
             can_king_castle: true,