diff --git a/src/Yi/Buffer/Implementation.hs b/src/Yi/Buffer/Implementation.hs
--- a/src/Yi/Buffer/Implementation.hs
+++ b/src/Yi/Buffer/Implementation.hs
@@ -62,6 +62,7 @@
   , markPointAA
   , markGravityAA
   , mem
+  , BufferImpl
   ) where
 
 import           GHC.Generics        (Generic)
diff --git a/yi-core.cabal b/yi-core.cabal
--- a/yi-core.cabal
+++ b/yi-core.cabal
@@ -3,7 +3,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           yi-core
-version:        0.13.4
+version:        0.13.5
 synopsis:       Yi editor core library
 category:       Yi
 homepage:       https://github.com/yi-editor/yi#readme