diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 <!-- -*- Markdown -*- -->
 
+## 0.7.0.1
+
+- update haddock about bracketed-prepare operations.
+
 ## 0.7.0.0
 
 - support overwriting of type-map along with column-name.
diff --git a/relational-query-HDBC.cabal b/relational-query-HDBC.cabal
--- a/relational-query-HDBC.cabal
+++ b/relational-query-HDBC.cabal
@@ -1,5 +1,5 @@
 name:                relational-query-HDBC
-version:             0.7.0.0
+version:             0.7.0.1
 synopsis:            HDBC instance of relational-query and typed query interface for HDBC
 description:         This package contains the HDBC instance of relational-query and
                      the typed query interface for HDBC.
diff --git a/src/Database/HDBC/Record/Query.hs b/src/Database/HDBC/Record/Query.hs
--- a/src/Database/HDBC/Record/Query.hs
+++ b/src/Database/HDBC/Record/Query.hs
@@ -62,6 +62,8 @@
 prepareQuery = prepare
 
 -- | Bracketed prepare operation.
+--   PreparedStatement is released on closing connection,
+--   so connection pooling cases often cause resource leaks.
 withPrepareQuery :: IConnection conn
                  => conn                        -- ^ Database connection
                  -> Query p a                   -- ^ Typed query
diff --git a/src/Database/HDBC/Record/Statement.hs b/src/Database/HDBC/Record/Statement.hs
--- a/src/Database/HDBC/Record/Statement.hs
+++ b/src/Database/HDBC/Record/Statement.hs
@@ -82,11 +82,15 @@
 prepareNoFetch conn = unsafePrepare conn . untypeNoFetch
 
 -- | Close PreparedStatement. Useful for connection pooling cases.
+--   PreparedStatement is released on closing connection,
+--   so connection pooling cases often cause resource leaks.
 finish :: PreparedStatement p a -> IO ()
 finish = HDBC.finish . prepared
 
 -- | Bracketed prepare operation.
 --   Unsafely make Typed prepared statement.
+--   PreparedStatement is released on closing connection,
+--   so connection pooling cases often cause resource leaks.
 withUnsafePrepare :: IConnection conn
                   => conn   -- ^ Database connection
                   -> String -- ^ Raw SQL String