diff --git a/rustbyexample/types/alias.rs b/rustbyexample/types/alias.rs
new file mode 100644
index 0000000..062c650
--- /dev/null
+++ b/rustbyexample/types/alias.rs
@@ -0,0 +1,15 @@
+type NanoSecond = u64;
+type Inch = u64;
+
+#[allow(non_camel_case_types)]
+type u64_t = u64;
+
+fn main() {
+    let nanoseconds: NanoSecond = 5 as u64_t;
+    let inches: Inch = 2 as u64_t;
+
+    println!("{} nanoseconds + {} inches = {} unit?",
+        nanoseconds,
+        inches,
+        nanoseconds + inches);
+}