diff --git a/arrow-string/src/like.rs b/arrow-string/src/like.rs
index 6d82682d724c..5c76d5c810a7 100644
--- a/arrow-string/src/like.rs
+++ b/arrow-string/src/like.rs
@@ -158,7 +158,9 @@ fn like_op(op: Op, lhs: &dyn Datum, rhs: &dyn Datum) -> Result<BooleanArray, Arr
 /// This trait helps to abstract over the different types of string arrays
 /// so that we don't need to duplicate the implementation for each type.
 pub trait StringArrayType<'a>: ArrayAccessor<Item = &'a str> + Sized {
+    /// Returns true if all data within this string array is ASCII
     fn is_ascii(&self) -> bool;
+    /// Constructs a new iterator
     fn iter(&self) -> ArrayIter<Self>;
 }