diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..fdb1306
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,3 @@
+### Checklist
+
+- [ ] Add a changelog if necessary. See <https://keepachangelog.com/> for how to write it.
diff --git a/lib/src/registers/doorbell.rs b/lib/src/registers/doorbell.rs
index 0406013..a162f06 100644
--- a/lib/src/registers/doorbell.rs
+++ b/lib/src/registers/doorbell.rs
@@ -3,7 +3,7 @@
 use super::capability::Capability;
 use accessor::array;
 use accessor::Mapper;
-use core::{convert::TryFrom, fmt};
+use core::convert::TryFrom;
 
 /// A type alias to [`Doorbell`] register for backward compability.
 #[deprecated = "Use `Doorbell` instead of `Register`."]
@@ -48,11 +48,7 @@ impl Doorbell {
     rw_field!(0..=7, doorbell_target, "Doorbell Target", u8);
     rw_field!(16..=31, doorbell_stream_id, "Doorbell Stream ID", u16);
 }
-impl fmt::Debug for Doorbell {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("doorbell::Register")
-            .field("doorbell_target", &self.doorbell_target())
-            .field("doorbell_stream_id", &self.doorbell_stream_id())
-            .finish()
-    }
-}
+impl_debug_from_methods!(Doorbell {
+    doorbell_target,
+    doorbell_stream_id,
+});
diff --git a/lib/src/registers/mod.rs b/lib/src/registers/mod.rs
index a34472c..b192dbd 100644
--- a/lib/src/registers/mod.rs
+++ b/lib/src/registers/mod.rs
@@ -4,6 +4,7 @@ use accessor::array;
 use accessor::Mapper;
 
 pub use capability::Capability;
+pub use doorbell::Doorbell;
 pub use operational::{Operational, PortRegisterSet};
 pub use runtime::InterrupterRegisterSet;
 pub use runtime::Runtime;
@@ -22,7 +23,7 @@ where
     /// Host Controller Capability Register
     pub capability: Capability<M>,
     /// Doorbell Array
-    pub doorbell: array::ReadWrite<doorbell::Doorbell, M>,
+    pub doorbell: array::ReadWrite<Doorbell, M>,
     /// Host Controller Operational Register
     pub operational: Operational<M>,
     /// Port Register Set Array