diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,6 @@
+## 0.3.4.1
+- Fix a haddock issue down-streamed from [#693](https://github.com/yesodweb/persistent/pull/693).
+
 ## 0.3.4
 - Port [#693](https://github.com/yesodweb/persistent/pull/693) from `mysql-haskell`: Extend the `SomeField` type to allow `insertManyOnDuplicateKeyUpdate` to conditionally copy values.
 - Port [#702](https://github.com/yesodweb/persistent/pull/702) from `mysql-haskell`: Fix behavior of `insertManyOnDuplicateKeyUpdate` to ignore duplicate key exceptions when no updates specified.
diff --git a/Database/Persist/MySQL.hs b/Database/Persist/MySQL.hs
--- a/Database/Persist/MySQL.hs
+++ b/Database/Persist/MySQL.hs
@@ -1111,11 +1111,11 @@
 -- @INSERT ON DUPLICATE KEY UPDATE@ functionality, exposed via
 -- 'insertManyOnDuplicateKeyUpdate' in the library.
 data SomeField record where
+  -- | Copy the field directly from the record.
   SomeField :: EntityField record typ -> SomeField record
-  -- ^ Copy the field directly from the record.
-  CopyUnlessEq :: PersistField typ => EntityField record typ -> typ -> SomeField record
-  -- ^ Only copy the field if it is not equal to the provided value.
+  -- | Only copy the field if it is not equal to the provided value.
   -- @since 2.6.2
+  CopyUnlessEq :: PersistField typ => EntityField record typ -> typ -> SomeField record
 
 -- | Copy the field into the database only if the value in the
 -- corresponding record is non-@NULL@.
diff --git a/persistent-mysql-haskell.cabal b/persistent-mysql-haskell.cabal
--- a/persistent-mysql-haskell.cabal
+++ b/persistent-mysql-haskell.cabal
@@ -1,5 +1,5 @@
 name:            persistent-mysql-haskell
-version:         0.3.4
+version:         0.3.4.1
 license:         MIT
 license-file:    LICENSE
 author:          Naushadh <naushadh@protonmail.com>, Felipe Lessa <felipe.lessa@gmail.com>, Michael Snoyman