diff --git a/src/board/castle_rights.rs b/src/board/castle_rights.rs
index b34d952..5b06544 100644
--- a/src/board/castle_rights.rs
+++ b/src/board/castle_rights.rs
@@ -18,6 +18,10 @@ impl CastleRights {
     pub const NUM_VARIANTS: usize = 4;
 
     /// Convert from a castle rights index into a [CastleRights] type.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the index is out of bounds.
     #[inline(always)]
     pub fn from_index(index: usize) -> Self {
         assert!(index < Self::NUM_VARIANTS);
diff --git a/src/board/color.rs b/src/board/color.rs
index 66b21b3..17ebcb5 100644
--- a/src/board/color.rs
+++ b/src/board/color.rs
@@ -19,6 +19,10 @@ impl Color {
     }
 
     /// Convert from a color index into a [Color] type.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the index is out of bounds.
     #[inline(always)]
     pub fn from_index(index: usize) -> Self {
         assert!(index < Self::NUM_VARIANTS);
diff --git a/src/board/file.rs b/src/board/file.rs
index 1475e9a..5398660 100644
--- a/src/board/file.rs
+++ b/src/board/file.rs
@@ -35,6 +35,10 @@ impl File {
     }
 
     /// Convert from a file index into a [File] type.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the index is out of bounds.
     #[inline(always)]
     pub fn from_index(index: usize) -> Self {
         assert!(index < Self::NUM_VARIANTS);
diff --git a/src/board/piece.rs b/src/board/piece.rs
index 58f989a..76d9df9 100644
--- a/src/board/piece.rs
+++ b/src/board/piece.rs
@@ -28,6 +28,10 @@ impl Piece {
     }
 
     /// Convert from a piece index into a [Piece] type.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the index is out of bounds.
     #[inline(always)]
     pub fn from_index(index: usize) -> Self {
         assert!(index < Self::NUM_VARIANTS);
diff --git a/src/board/rank.rs b/src/board/rank.rs
index f448df5..f716bde 100644
--- a/src/board/rank.rs
+++ b/src/board/rank.rs
@@ -35,6 +35,10 @@ impl Rank {
     }
 
     /// Convert from a rank index into a [Rank] type.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the index is out of bounds.
     #[inline(always)]
     pub fn from_index(index: usize) -> Self {
         assert!(index < Self::NUM_VARIANTS);
diff --git a/src/board/square.rs b/src/board/square.rs
index 958c3c9..afbd9bf 100644
--- a/src/board/square.rs
+++ b/src/board/square.rs
@@ -39,6 +39,10 @@ impl Square {
     ];
 
     /// Construct a [Square] from a [File] and [Rank].
+    ///
+    /// # Panics
+    ///
+    /// Panics if the index is out of bounds.
     #[inline(always)]
     pub fn new(file: File, rank: Rank) -> Self {
         // SAFETY: we know the value is in-bounds