diff --git a/README.md b/README.md
index a684d20..8cd2416 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,5 @@
-# Dunge
-
 <div align="center">
+    <h1>Dunge</h1>
     <p>
         Simple and portable 3d render based on <a href="https://github.com/gfx-rs/wgpu">WGPU</a>.
     </p>
diff --git a/dunge/src/context.rs b/dunge/src/context.rs
index ba75d5f..5ccd175 100644
--- a/dunge/src/context.rs
+++ b/dunge/src/context.rs
@@ -121,12 +121,12 @@ impl Context {
 
 /// An error returned from the [context](Context) constructor.
 #[derive(Debug)]
-pub enum Error {
+pub enum MakeContextError {
     BackendSelection,
     RequestDevice(wgpu::RequestDeviceError),
 }
 
-impl fmt::Display for Error {
+impl fmt::Display for MakeContextError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             Self::BackendSelection => write!(f, "failed to select backend"),
@@ -135,4 +135,11 @@ impl fmt::Display for Error {
     }
 }
 
-impl error::Error for Error {}
+impl error::Error for MakeContextError {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        match self {
+            Self::BackendSelection => None,
+            Self::RequestDevice(err) => Some(err),
+        }
+    }
+}
diff --git a/dunge/src/init.rs b/dunge/src/init.rs
index 6b53196..bc125e8 100644
--- a/dunge/src/init.rs
+++ b/dunge/src/init.rs
@@ -1,6 +1,6 @@
 use {
     crate::{
-        context::{self, Context},
+        context::{Context, MakeContextError},
         state::State,
     },
     wgpu::Instance,
@@ -9,7 +9,7 @@ use {
 #[cfg(feature = "winit")]
 use crate::{element::Element, window::WindowBuilder};
 
-pub(crate) async fn make() -> Result<(Context, Instance), context::Error> {
+pub(crate) async fn make() -> Result<(Context, Instance), MakeContextError> {
     use wgpu::{Backends, InstanceDescriptor, InstanceFlags};
 
     let backends;
@@ -44,8 +44,8 @@ pub(crate) async fn make() -> Result<(Context, Instance), context::Error> {
 ///
 /// # Errors
 /// Returns an error when the context could not be created.
-/// See [`Error`](context::Error) for details.
-pub async fn context() -> Result<Context, context::Error> {
+/// See [`MakeContextError`] for details.
+pub async fn context() -> Result<Context, MakeContextError> {
     make().await.map(|(cx, _)| cx)
 }
 
diff --git a/dunge/src/lib.rs b/dunge/src/lib.rs
index 1269006..acb1149 100644
--- a/dunge/src/lib.rs
+++ b/dunge/src/lib.rs
@@ -38,7 +38,7 @@ pub mod prelude {
 
 pub use {
     crate::{
-        context::{Context, Error},
+        context::{Context, MakeContextError},
         draw::{draw, Draw},
         format::Format,
         init::context,
diff --git a/dunge/src/state.rs b/dunge/src/state.rs
index 1a7281d..ad92300 100644
--- a/dunge/src/state.rs
+++ b/dunge/src/state.rs
@@ -1,7 +1,7 @@
 use {
     crate::{
         color::Rgba,
-        context::Error,
+        context::MakeContextError,
         draw::Draw,
         format::Format,
         layer::{Layer, SetLayer},
@@ -23,7 +23,7 @@ pub(crate) struct State {
 }
 
 impl State {
-    pub async fn new(instance: &Instance) -> Result<Self, Error> {
+    pub async fn new(instance: &Instance) -> Result<Self, MakeContextError> {
         let adapter = {
             use wgpu::{PowerPreference, RequestAdapterOptions};
 
@@ -35,7 +35,7 @@ impl State {
             instance
                 .request_adapter(&options)
                 .await
-                .ok_or(Error::BackendSelection)?
+                .ok_or(MakeContextError::BackendSelection)?
         };
 
         let backend = adapter.get_info().backend;
@@ -58,7 +58,7 @@ impl State {
             adapter
                 .request_device(&desc, None)
                 .await
-                .map_err(Error::RequestDevice)?
+                .map_err(MakeContextError::RequestDevice)?
         };
 
         Ok(Self {
diff --git a/dunge/src/window.rs b/dunge/src/window.rs
index f29c0c8..021ab78 100644
--- a/dunge/src/window.rs
+++ b/dunge/src/window.rs
@@ -2,7 +2,7 @@
 
 use {
     crate::{
-        context::{self, Context},
+        context::{Context, MakeContextError},
         el::Loop,
         element::Element,
         format::Format,
@@ -320,8 +320,8 @@ impl From<CreateSurfaceError> for Error {
     }
 }
 
-impl From<context::Error> for Error {
-    fn from(v: context::Error) -> Self {
+impl From<MakeContextError> for Error {
+    fn from(v: MakeContextError) -> Self {
         Self(ErrorKind::Context(v))
     }
 }
@@ -356,5 +356,5 @@ enum ErrorKind {
     EventLoop(EventLoopError),
     Os(OsError),
     Surface(CreateSurfaceError),
-    Context(context::Error),
+    Context(MakeContextError),
 }
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 93243be..0c1147c 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -12,7 +12,7 @@ fn run() -> Result<(), Error> {
     let module = env::args().nth(1).ok_or("no module specified")?;
     let root = Path::new(&env!("CARGO_MANIFEST_DIR"))
         .parent()
-        .expect("root dir");
+        .ok_or("root dir not found")?;
 
     let status = Command::new("wasm-pack")
         .current_dir(root)