diff --git a/README.md b/README.md
index cd013d0..536f742 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,8 @@ fn main() {
     };
 
     let encoded: Vec<u8> = bincode::encode(&world).unwrap();
+    // 8 bytes for the length of the vector, 4 bytes per float.
+    assert_eq!(encoded.len(), 8 + 4 * 4);
     let decoded: World = bincode::decode(encoded).unwrap();
 
     assert!(world == decoded);
diff --git a/examples/basic.rs b/examples/basic.rs
index f9d9f0b..eaf103e 100644
--- a/examples/basic.rs
+++ b/examples/basic.rs
@@ -18,6 +18,8 @@ fn main() {
     };
 
     let encoded: Vec<u8> = bincode::encode(&world).unwrap();
+    // 8 bytes for the length of the vector, 4 bytes per float.
+    assert_eq!(encoded.len(), 8 + 4 * 4);
     let decoded: World = bincode::decode(encoded).unwrap();
 
     assert!(world == decoded);