diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 0.5.2
+
+* Enable rawConnectionModifySocketSize to expose openSocketConnectionSize [#218](https://github.com/snoyberg/http-client/pull/218)
+
 ## 0.5.1
 
 * Enable managerModifyRequest to modify redirectCount [#208](https://github.com/snoyberg/http-client/pull/208)
diff --git a/Network/HTTP/Client.hs b/Network/HTTP/Client.hs
--- a/Network/HTTP/Client.hs
+++ b/Network/HTTP/Client.hs
@@ -126,6 +126,7 @@
     , responseTimeoutDefault
       -- *** Helpers
     , rawConnectionModifySocket
+    , rawConnectionModifySocketSize
       -- * Request
     , parseUrl
     , parseUrlThrow
diff --git a/Network/HTTP/Client/Manager.hs b/Network/HTTP/Client/Manager.hs
--- a/Network/HTTP/Client/Manager.hs
+++ b/Network/HTTP/Client/Manager.hs
@@ -12,6 +12,7 @@
     , getConn
     , defaultManagerSettings
     , rawConnectionModifySocket
+    , rawConnectionModifySocketSize
     , proxyFromRequest
     , noProxy
     , useProxy
@@ -66,14 +67,13 @@
                           -> IO (Maybe NS.HostAddress -> String -> Int -> IO Connection)
 rawConnectionModifySocket = return . openSocketConnection
 
-{- FIXME was this intended to be exported?
 -- | Same as @rawConnectionModifySocket@, but also takes in a chunk size.
 --
--- Since 0.4.5
+-- @since 0.5.2
 rawConnectionModifySocketSize :: (NS.Socket -> IO ())
                               -> IO (Int -> Maybe NS.HostAddress -> String -> Int -> IO Connection)
 rawConnectionModifySocketSize = return . openSocketConnectionSize
--}
+
 
 -- | Default value for @ManagerSettings@.
 --
diff --git a/http-client.cabal b/http-client.cabal
--- a/http-client.cabal
+++ b/http-client.cabal
@@ -1,5 +1,5 @@
 name:                http-client
-version:             0.5.1
+version:             0.5.2
 synopsis:            An HTTP client engine
 description:         Hackage documentation generation is not reliable. For up to date documentation, please see: <http://www.stackage.org/package/http-client>.
 homepage:            https://github.com/snoyberg/http-client