diff --git a/src/position.rs b/src/position.rs
index 01ad1c9..3b28e88 100644
--- a/src/position.rs
+++ b/src/position.rs
@@ -124,7 +124,7 @@ impl Position {
         moves.len
     }
 
-    /// Discards the optional en passant target square.
+    /// Discards the en passant target square.
     ///
     /// This function is useful to check for position equality, notably when implementing FIDE's
     /// draw by repetition rules. Note that this function will remove the en passant target square
@@ -153,10 +153,9 @@ impl Position {
         self.0
     }
 
-    /// Tries to pass the turn to the other color, failing if it would leave the king in check.
-    ///
-    /// When possible, this inverts the color to play and removes the en passant square if it
-    /// exists.
+    /// Returns the position after after passing the turn to the other color,
+    /// and `None` if the king in check. On success, this inverts the color to
+    /// play and discards the en passant square.
     pub fn pass(&self) -> Option<Self> {
         let setup = &self.0;
         let blockers = setup.p_b_q | setup.n_b_k | setup.r_q_k;