diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..490f945
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[workspace]
+
+members = [
+    # userspace commands
+    "usr/src/mei/true",
+    "usr/src/mei/pwd",
+    "usr/src/mei/yes",
+    "usr/src/mei/echo",
+    "usr/src/mei/printf",
+    # system
+    "usr/src/kei",
+]
diff --git a/usr/src/Cargo.toml b/usr/src/Cargo.toml
deleted file mode 100644
index e05b531..0000000
--- a/usr/src/Cargo.toml
+++ /dev/null
@@ -1,11 +0,0 @@
-[workspace]
-
-members = [
-    # userspace commands
-    "mei/true",
-    "mei/pwd",
-    "mei/yes",
-    "mei/echo",
-    # system
-    "kei",
-]
diff --git a/usr/src/mei/printf/Cargo.toml b/usr/src/mei/printf/Cargo.toml
new file mode 100644
index 0000000..1dded1e
--- /dev/null
+++ b/usr/src/mei/printf/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "printf"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "printf"
+path = "src/main.rs"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/usr/src/mei/printf/src/main.rs b/usr/src/mei/printf/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/usr/src/mei/printf/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}