diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+2.8.1
+---
+
+- Better error message in `validateSchemaType` (see [#221](https://github.com/GetShopTV/swagger2/pull/221));
+
 2.8
 ---
 
diff --git a/src/Data/Swagger/Internal/Schema/Validation.hs b/src/Data/Swagger/Internal/Schema/Validation.hs
--- a/src/Data/Swagger/Internal/Schema/Validation.hs
+++ b/src/Data/Swagger/Internal/Schema/Validation.hs
@@ -485,7 +485,13 @@
     (Nothing, String s)               -> sub_ paramSchema (validateString s)
     (Nothing, Array xs)               -> sub_ paramSchema (validateArray xs)
     (Nothing, Object o)               -> validateObject $ KM.toHashMapText o
-    bad -> invalid $ "expected JSON value of type " ++ showType bad
+    bad -> invalid $ unlines
+      [ unwords ["expected JSON value of type", showType bad]
+      , "  with context:"
+      , "    " <> unwords ["SwaggerType:", show $ fst bad]
+      , "    " <> unwords ["Aeson Value:", show $ snd bad]
+      , "    " <> unwords ["Schema title:", show $ sch ^. title]
+      ]
 
 validateParamSchemaType :: Value -> Validation (ParamSchema t) ()
 validateParamSchemaType value = withSchema $ \sch ->
diff --git a/src/Data/Swagger/Schema/Validation.hs b/src/Data/Swagger/Schema/Validation.hs
--- a/src/Data/Swagger/Schema/Validation.hs
+++ b/src/Data/Swagger/Schema/Validation.hs
@@ -71,11 +71,11 @@
 -- generally fails for @null@ JSON:
 --
 -- >>> validateToJSON (Nothing :: Maybe String)
--- ["expected JSON value of type SwaggerString"]
+-- ["expected JSON value of type SwaggerString\n  with context:\n    SwaggerType: Just SwaggerString\n    Aeson Value: Null\n    Schema title: Nothing\n"]
 -- >>> validateToJSON ([Just "hello", Nothing] :: [Maybe String])
--- ["expected JSON value of type SwaggerString"]
+-- ["expected JSON value of type SwaggerString\n  with context:\n    SwaggerType: Just SwaggerString\n    Aeson Value: Null\n    Schema title: Nothing\n"]
 -- >>> validateToJSON (123, Nothing :: Maybe String)
--- ["expected JSON value of type SwaggerString"]
+-- ["expected JSON value of type SwaggerString\n  with context:\n    SwaggerType: Just SwaggerString\n    Aeson Value: Null\n    Schema title: Nothing\n"]
 --
 -- However, when @'Maybe' a@ is a type of a record field,
 -- validation takes @'required'@ property of the @'Schema'@
diff --git a/swagger2.cabal b/swagger2.cabal
--- a/swagger2.cabal
+++ b/swagger2.cabal
@@ -1,6 +1,6 @@
 cabal-version:       >=1.10
 name:                swagger2
-version:             2.8
+version:             2.8.1
 
 synopsis:            Swagger 2.0 data model
 category:            Web, Swagger