diff --git a/VERSION_HISTORY.md b/VERSION_HISTORY.md
index 63ec873..7ee63ba 100644
--- a/VERSION_HISTORY.md
+++ b/VERSION_HISTORY.md
@@ -2,6 +2,12 @@
 
 #### 2.0.0
 
+There were two major reasons for breaking backwards compatibility with this update.  The first was a refactor required to expand the width of the RSA and HMAC-SHA signing implementations.  There will likely be no required code changes to support this change.
+
+The second update, while unfortunately requiring a small change in integration, is required to open up this library to other signing methods.  Not all keys used for all signing methods have a single standard on-disk representation.  Requiring `[]byte` as the type for all keys proved too limiting.  Additionally, this implementation allows for pre-parsed tokens to be reused, which might matter in an application that parses a high volume of tokens with a small set of keys.  Backwards compatibilty has been maintained for passing `[]byte` to the RSA signing methods, but they will also accept `*rsa.PublicKey` and `*rsa.PrivateKey`.
+
+It is likely the only integration change required here will be to change `func(t *jwt.Token) ([]byte, error)` to `func(t *jwt.Token) (interface{}, error)` when calling `Parse`.
+
 * **Compatibility Breaking Changes**
 	* `SigningMethodHS256` is now `*SigningMethodHMAC` instead of `type struct`
 	* `SigningMethodRS256` is now `*SigningMethodRSA` instead of `type struct`