diff --git a/wasm01/build.zig b/wasm01/build.zig
new file mode 100644
index 0000000..a7d40cb
--- /dev/null
+++ b/wasm01/build.zig
@@ -0,0 +1,17 @@
+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    // Standard release options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
+    const mode = b.standardReleaseOptions();
+
+    const lib = b.addStaticLibrary("wasm01", "src/main.zig");
+    lib.setBuildMode(mode);
+    lib.install();
+
+    const main_tests = b.addTest("src/main.zig");
+    main_tests.setBuildMode(mode);
+
+    const test_step = b.step("test", "Run library tests");
+    test_step.dependOn(&main_tests.step);
+}
diff --git a/wasm01/justfile b/wasm01/justfile
new file mode 100644
index 0000000..17e4dc4
--- /dev/null
+++ b/wasm01/justfile
@@ -0,0 +1,7 @@
+_:
+  @just --list
+
+
+build:
+  zig build-lib src/main.zig -target wasm32-freestanding-musl -dynamic -O ReleaseSmall --export=add
+
diff --git a/wasm01/src/main.zig b/wasm01/src/main.zig
new file mode 100644
index 0000000..ecfeade
--- /dev/null
+++ b/wasm01/src/main.zig
@@ -0,0 +1,10 @@
+const std = @import("std");
+const testing = std.testing;
+
+export fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+test "basic add functionality" {
+    try testing.expect(add(3, 7) == 10);
+}