diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 0721ff9..ee3432e 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -42,3 +42,9 @@ jobs:
         shell: bash
         run: |
           stack build
+
+      - name: Check Formatting
+        shell: bash
+        run: |
+          stack install ormolu
+          ormolu -o -XTypeApplications -o -XCPP -m check $(find . -type f -name "*.hs")
diff --git a/package.yaml b/package.yaml
index a3308cc..6c86176 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,18 +1,31 @@
 name: deriving-openapi3
 version: 0.1.0.0
 synopsis: DerivingVia for OpenAPI 3
-# description:
+description: See <https://github.com/ilyakooo0/deriving-openapi3 GitHub> for more details.
 maintainer: Ilya Kostyuchenko <ilyakooo0@gmail.com>
+category: JSON, Generics
+license: MIT
 github: ilyakooo0/deriving-openapi3
-ghc-options: -Wall
+ghc-options: -Weverything
+  -Wno-star-is-type
+  -Wno-unsafe
+  -Wno-prepositive-qualified-module
+  -Wno-safe
+  -Wno-missing-safe-haskell-mode
+  -Wno-missing-import-lists
+  -Wno-implicit-prelude
 dependencies:
   - base
   - openapi3
   - deriving-aeson
   - aeson
-  - servant
   - lens
   - text
+when:
+  - condition: flag(servant-description)
+    dependencies:
+      - servant
+    cpp-options: -DSERVANT_DESCRIPTION
 library:
   source-dirs: src
 default-extensions:
@@ -27,3 +40,8 @@ default-extensions:
   - TypeFamilies
   - PolyKinds
   - OverloadedStrings
+flags:
+  servant-description:
+    description: Create instances for the 'Description' type from 'servant'
+    default: true
+    manual: false
diff --git a/src/Deriving/OpenApi.hs b/src/Deriving/OpenApi.hs
index 8e61f36..61c165f 100644
--- a/src/Deriving/OpenApi.hs
+++ b/src/Deriving/OpenApi.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# OPTIONS_GHC -Wno-orphans #-}
 
 module Deriving.OpenApi
@@ -15,13 +16,28 @@ import Data.Kind
 import Data.OpenApi
 import Data.OpenApi.Internal.Schema
 import Data.Proxy
-import Data.Text (Text)
-import qualified Data.Text as T
 import Data.Typeable
 import Deriving.Aeson
 import GHC.Generics
 import GHC.TypeLits
+
+#ifdef SERVANT_DESCRIPTION
+
 import Servant.API
+import Data.Text (Text)
+import qualified Data.Text as T
+
+instance (AesonOptions xs) => AesonOptions (Description f ': xs) where
+  aesonOptions = aesonOptions @xs
+
+instance (OpenApiOptions xs, KnownSymbol t) => OpenApiOptions (Description t ': xs) where
+  openApiOptions = openApiOptions @xs
+  openApiSchemaModifier = schema . description <>~ Just (toTextLine @t)
+
+toTextLine :: forall s. KnownSymbol s => Text
+toTextLine = "\n\n" <> T.pack (symbolVal (Proxy @s))
+
+#endif
 
 type CustomOpenApi = CustomJSON
 
@@ -37,16 +53,6 @@ instance (StringModifier f, OpenApiOptions xs) => OpenApiOptions (DatatypeNameMo
 instance (AesonOptions xs) => AesonOptions (DatatypeNameModifier f ': xs) where
   aesonOptions = aesonOptions @xs
 
-instance (AesonOptions xs) => AesonOptions (Description f ': xs) where
-  aesonOptions = aesonOptions @xs
-
-instance (OpenApiOptions xs, KnownSymbol t) => OpenApiOptions (Description t ': xs) where
-  openApiOptions = openApiOptions @xs
-  openApiSchemaModifier = schema . description <>~ Just (toTextLine @t)
-
-toTextLine :: forall s. KnownSymbol s => Text
-toTextLine = "\n\n" <> T.pack (symbolVal (Proxy @s))
-
 type family (++) (x :: [k]) (y :: [k]) :: [k] where
   (++) '[] ys = ys
   (++) (x ': xs) ys = xs ++ (x ': ys)