diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 2.6.2.1
+
+* Fix haddock documentation [#725](https://github.com/yesodweb/persistent/pull/725)
+
 ## 2.6.2
 
 * Extend the `SomeField` type to allow `insertManyOnDuplicateKeyUpdate` to conditionally copy values.
diff --git a/Database/Persist/MySQL.hs b/Database/Persist/MySQL.hs
--- a/Database/Persist/MySQL.hs
+++ b/Database/Persist/MySQL.hs
@@ -1048,12 +1048,13 @@
 -- | This type is used to determine how to update rows using MySQL's
 -- @INSERT ON DUPLICATE KEY UPDATE@ functionality, exposed via
 -- 'insertManyOnDuplicateKeyUpdate' in the library.
+--
+-- @since 2.6.2
 data SomeField record where
+  -- | Copy the field directly from the record.
   SomeField :: EntityField record typ -> SomeField record
-  -- ^ Copy the field directly from the record.
+  -- | Only copy the field if it is not equal to the provided value.
   CopyUnlessEq :: PersistField typ => EntityField record typ -> typ -> SomeField record
-  -- ^ Only copy the field if it is not equal to the provided value.
-  -- @since 2.6.2
 
 -- | Copy the field into the database only if the value in the
 -- corresponding record is non-@NULL@.
diff --git a/persistent-mysql.cabal b/persistent-mysql.cabal
--- a/persistent-mysql.cabal
+++ b/persistent-mysql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-mysql
-version:         2.6.2
+version:         2.6.2.1
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa <felipe.lessa@gmail.com>, Michael Snoyman