diff --git a/README.md b/README.md
index f95a702..d8f7c0f 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,19 @@ nonce, encrypted = Cox.encrypt(data, bob.public, alice.secret)
 decrypted = Cox.decrypt(encrypted, nonce, alice.public, bob.secret)
 
 String.new(decrypted) # => "Hello World!"
+
+
+# Public key signing
+
+message = "Hello World!"
+
+signing_pair = Cox::SignKeyPair.new
+
+# Sign the message
+signature = Cox.sign(message, signing_pair.secret)
+
+# And verify
+Cox.verify(signature, message, signing_pair.public) # => true
 ```
 
 ## Contributing
@@ -52,3 +65,4 @@ String.new(decrypted) # => "Hello World!"
 ## Contributors
 
 - [andrewhamon](https://github.com/andrewhamon) Andrew Hamon - creator, maintainer
+- [dorkrawk](https://github.com/dorkrawk) Dave Schwantes - contributor
diff --git a/src/cox/lib_sodium.cr b/src/cox/lib_sodium.cr
index 020e97c..8139fb0 100644
--- a/src/cox/lib_sodium.cr
+++ b/src/cox/lib_sodium.cr
@@ -3,21 +3,21 @@ module Cox
   lib LibSodium
     fun sodium_init() : LibC::Int
 
-    fun crypto_box_publickeybytes() : LibC::SizeT
-    fun crypto_box_secretkeybytes() : LibC::SizeT
-    fun crypto_box_noncebytes()     : LibC::SizeT
-    fun crypto_box_macbytes()       : LibC::SizeT
+    fun crypto_box_publickeybytes()  : LibC::SizeT
+    fun crypto_box_secretkeybytes()  : LibC::SizeT
+    fun crypto_box_noncebytes()      : LibC::SizeT
+    fun crypto_box_macbytes()        : LibC::SizeT
     fun crypto_sign_publickeybytes() : LibC::SizeT
     fun crypto_sign_secretkeybytes() : LibC::SizeT
-    fun crypto_sign_bytes()         : LibC::SizeT
+    fun crypto_sign_bytes()          : LibC::SizeT
 
-    PUBLIC_KEY_BYTES = crypto_box_publickeybytes()
-    SECRET_KEY_BYTES = crypto_box_secretkeybytes()
-    NONCE_BYTES      = crypto_box_macbytes()
-    MAC_BYTES        = crypto_box_macbytes()
+    PUBLIC_KEY_BYTES  = crypto_box_publickeybytes()
+    SECRET_KEY_BYTES  = crypto_box_secretkeybytes()
+    NONCE_BYTES       = crypto_box_macbytes()
+    MAC_BYTES         = crypto_box_macbytes()
     PUBLIC_SIGN_BYTES = crypto_sign_publickeybytes()
     SECRET_SIGN_BYTES = crypto_sign_secretkeybytes()
-    SIGNATURE_BYTES  = crypto_sign_bytes()
+    SIGNATURE_BYTES   = crypto_sign_bytes()
 
     fun crypto_box_keypair(
       public_key_output : Pointer(LibC::UChar),