diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..a8ec5d0
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,42 @@
+sudo: false
+language: rust
+rust:
+- nightly
+- beta
+- stable
+matrix:
+  allow_failures:
+  - rust: nightly
+before_script:
+- ! 'pip install ''travis-cargo<0.2'' --user &&
+
+  export PATH=$HOME/.local/bin:$PATH
+
+'
+script:
+- ! 'travis-cargo build &&
+
+  travis-cargo test &&
+
+  travis-cargo bench &&
+
+  travis-cargo --only stable doc
+
+'
+addons:
+  apt:
+    packages:
+    - libcurl4-openssl-dev
+    - libelf-dev
+    - libdw-dev
+    - libsodium13
+    - libsodium-dev
+after_success:
+- travis-cargo --only stable doc-upload
+- travis-cargo coveralls --no-sudo
+notifications:
+  email:
+    on_success: never
+env:
+  global:
+  - TRAVIS_CARGO_NIGHTLY_FEATURE=""
diff --git a/vpncloud.md b/vpncloud.md
index a2676e7..f0aa051 100644
--- a/vpncloud.md
+++ b/vpncloud.md
@@ -228,6 +228,7 @@ Every packet sent over UDP contains the following header (in order):
     order. Currently the following additional headers are supported:
 
     - Bit 1: Network ID
+    - Bit 2: Crypto information
 
   * 1 byte for the `message type`
 
@@ -246,6 +247,13 @@ field will follow in the order of their respective flag bits.
 
     The network id is encoded as 8 bytes.
 
+  * **Crypto information**:
+
+    If this header is present, the contents of the message are encrypted and
+    must have to decrypted before decoding.
+    This option contains 40 bytes. The first 8 bytes are the **nonce** for this
+    message and the later 32 bytes are the **authentication hash** of the
+    message.
 
 After the additional headers, message as specified in the `message type` field
 will follow: