diff --git a/examples/mnist.rs b/examples/mnist.rs
index 01838c3..3ebebe4 100644
--- a/examples/mnist.rs
+++ b/examples/mnist.rs
@@ -47,8 +47,8 @@ fn main() {
             .into_iter()
             .map(|v| v as f32)
             .collect::<Vec<_>>();
-        
-        let v: [f32; 28*28] = img_to_vec.try_into().unwrap();
+
+        let v: [f32; 28 * 28] = img_to_vec.try_into().unwrap();
         ann.add_item(v, None);
 
         if i % 1_000 == 0 {
@@ -74,7 +74,7 @@ fn main() {
             .map(|v| v as f32)
             .collect::<Vec<_>>();
 
-        let v: [f32; 28*28] = img_to_vec.try_into().unwrap();
+        let v: [f32; 28 * 28] = img_to_vec.try_into().unwrap();
         let (result, _distance) = ann.query(v, 1, None);
         let actual = result
             .into_iter()
@@ -89,4 +89,4 @@ fn main() {
             println!("{}\n{}", trn, tst);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/lib.rs b/src/lib.rs
index 220fe5e..b8d3e46 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
+use libc::{c_float, c_int, c_uint, c_void};
 use std::ffi::CString;
 use std::path::Path;
-use libc::{c_float, c_int, c_uint, c_void};
 
 pub enum Index {}
 
@@ -42,8 +42,8 @@ mod ffi {
     }
 }
 
-pub struct Voyager<const N : usize> {
-    ix: *mut Index
+pub struct Voyager<const N: usize> {
+    ix: *mut Index,
 }
 
 impl<const N: usize> Voyager<N> {
@@ -54,7 +54,9 @@ impl<const N: usize> Voyager<N> {
         Voyager { ix: index }
     }
 
-    pub const fn dimension() -> usize { N }
+    pub const fn dimension() -> usize {
+        N
+    }
 
     pub fn add_item(&self, w: [f32; N], id: Option<u32>) {
         let len = w.len();
@@ -116,6 +118,12 @@ impl<const N: usize> Drop for Voyager<N> {
     }
 }
 
+impl<const N: usize> Default for Voyager<N> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;