diff --git a/src/descriptors.rs b/src/descriptors.rs
index eca7118..d4b0e02 100644
--- a/src/descriptors.rs
+++ b/src/descriptors.rs
@@ -5,6 +5,9 @@ pub trait Descriptor {
         "Descriptor".to_string()
     }
     fn describe(&self, img: image::DynamicImage) -> u64;
+    fn distance(&self, a: u64, b: u64) -> u64 {
+        (a^b).count_ones().into()
+    }
 }
 
 pub struct Median;
diff --git a/src/main.rs b/src/main.rs
index 8df3dd6..168efd9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,7 +7,11 @@ fn main() {
     let img0 = image::open("img/meowl.jpg").unwrap();
     let img1 = image::open("img/nyameowl.jpg").unwrap();
     let img2 = image::open("img/armmeowl.jpg").unwrap();
-    println!("{:#x}", desc.describe(img0));
-    println!("{:#x}", desc.describe(img1));
-    println!("{:#x}", desc.describe(img2));
+    let img0_phash = desc.describe(img0);
+    let img1_phash = desc.describe(img1);
+    let img2_phash = desc.describe(img2);
+    println!("{:#x}", img0_phash);
+    println!("{:#x}", img1_phash);
+    println!("{:#x}", img2_phash);
+    println!("meowl and armmeowl are {} different", desc.distance(img0_phash, img2_phash));
 }