1 files changed, 10 insertions, 0 deletions
diff --git a/src/libstd/tuple.rs b/src/libstd/tuple.rs
index 639df89a377..da2c52014e8 100644
--- a/src/libstd/tuple.rs
+++ b/src/libstd/tuple.rs
@@ -10,14 +10,20 @@
 
 //! Operations on tuples
 
+#[allow(missing_doc)];
+
 use kinds::Copy;
 use vec;
 
 pub use self::inner::*;
 
+/// Method extensions to pairs where both types satisfy the `Copy` bound
 pub trait CopyableTuple<T, U> {
+    /// Return the first element of self
     fn first(&self) -> T;
+    /// Return the second element of self
     fn second(&self) -> U;
+    /// Return the results of swapping the two elements of self
     fn swap(&self) -> (U, T);
 }
 
@@ -47,8 +53,12 @@ impl<T:Copy,U:Copy> CopyableTuple<T, U> for (T, U) {
     }
 }
 
+/// Method extensions for pairs where the types don't necessarily satisfy the
+/// `Copy` bound
 pub trait ImmutableTuple<T, U> {
+    /// Return a reference to the first element of self
     fn first_ref<'a>(&'a self) -> &'a T;
+    /// Return a reference to the second element of self
     fn second_ref<'a>(&'a self) -> &'a U;
 }