diff --git a/src/array_string.rs b/src/array_string.rs
index ce98056..a02100a 100644
--- a/src/array_string.rs
+++ b/src/array_string.rs
@@ -31,6 +31,7 @@ pub struct ArrayString<A: Array<Item=u8>> {
 }
 
 impl<A: Array<Item=u8>> Default for ArrayString<A> {
+    /// Return an empty `ArrayString`
     fn default() -> ArrayString<A> {
         ArrayString::new()
     }
diff --git a/src/lib.rs b/src/lib.rs
index 3a36aa4..b7467da 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -942,6 +942,7 @@ impl<A: Array> fmt::Debug for ArrayVec<A> where A::Item: fmt::Debug {
 }
 
 impl<A: Array> Default for ArrayVec<A> {
+    /// Return an empty array
     fn default() -> ArrayVec<A> {
         ArrayVec::new()
     }