diff --git a/src/ast.rs b/src/ast.rs
index 9337e96..95cf607 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -45,7 +45,7 @@ pub struct OptimizedAst<T>
 {
    /// Node data in a linear layout (DFS or BFS order).
    pub nodes: Vec<NodeData<T>>,
-   /// Each node’s parent, if any.
+   /// Each node's parent, if any.
    pub parents: Vec<Option<NodeId>>,
    /// The traversal order the nodes are stored in.
    pub order: TraversalOrder