diff --git a/Cargo.toml b/Cargo.toml
index e14cb7f..ae04b7e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "arrayvec"
-version = "0.3.16"
+version = "0.3.17"
 authors = ["bluss"]
 license = "MIT/Apache-2.0"
 
@@ -15,10 +15,11 @@ version = "0.2.12"
 default-features = false
 
 [dependencies.nodrop]
-version = "0.1.6"
+version = "0.1.8"
 path = "nodrop"
 default-features = false
 
 [features]
 default = ["std"]
 std = ["odds/std", "nodrop/std"]
+use_union = ["nodrop/use_union"]
diff --git a/Makefile b/Makefile
index bed90ff..2617b1e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
-DOCCRATES = arrayvec nodrop odds
+DOCCRATES = arrayvec nodrop nodrop_union odds
 
 # deps to delete the generated docs
 RMDOCS = 
 
-FEATURES = odds/unstable
+FEATURES = "odds/unstable nodrop/use_union"
 
 VERSIONS = $(patsubst %,target/VERS/%,$(DOCCRATES))
 
diff --git a/README.rst b/README.rst
index 564520b..6fd1407 100644
--- a/README.rst
+++ b/README.rst
@@ -22,6 +22,11 @@ __ http://bluss.github.io/arrayvec
 Recent Changes (arrayvec)
 -------------------------
 
+- 0.3.17
+
+  - Added crate feature ``use_union`` which forwards to the nodrop crate feature
+  - Added methods ``.is_full()`` to ``ArrayVec`` and ``ArrayString``.
+
 - 0.3.16
 
   - Added method ``.retain()`` to ``ArrayVec``.
diff --git a/src/lib.rs b/src/lib.rs
index f651811..15dfc7f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,12 @@
 //!   - Optional, enabled by default
 //!   - Requires Rust 1.6 *to disable*
 //!   - Use libstd
+//!
+//! - `use_union`
+//!   - Optional
+//!   - Requires Rust nightly channel
+//!   - Use the unstable feature untagged unions for the internal implementation,
+//!     which has reduced space overhead
 #![cfg_attr(not(feature="std"), no_std)]
 extern crate odds;
 extern crate nodrop;