diff --git a/hasql-backend.cabal b/hasql-backend.cabal
--- a/hasql-backend.cabal
+++ b/hasql-backend.cabal
@@ -1,7 +1,7 @@
 name:
   hasql-backend
 version:
-  0.1.0
+  0.2.0
 synopsis:
   API for backends of "hasql"
 description:
diff --git a/library/Hasql/Backend.hs b/library/Hasql/Backend.hs
--- a/library/Hasql/Backend.hs
+++ b/library/Hasql/Backend.hs
@@ -63,9 +63,10 @@
 
 
 -- |
--- A template statement with values for placeholders.
+-- A statement template with values for placeholders
+-- and a flag, defining, whether it is preparable.
 type Statement b =
-  (ByteString, [StatementArgument b])
+  (ByteString, [StatementArgument b], Bool)
 
 
 class Backend b where