diff --git a/Cargo.toml b/Cargo.toml
index 3cb68aa1..fe1fd495 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -76,4 +76,5 @@ path = "src/lib.rs"
 [workspace]
 members = [
     "crates/token",
+    "crates/revdb",
 ]
\ No newline at end of file
diff --git a/crates/revdb/Cargo.toml b/crates/revdb/Cargo.toml
new file mode 100644
index 00000000..4cb30ad7
--- /dev/null
+++ b/crates/revdb/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "revdb"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/crates/revdb/src/lib.rs b/crates/revdb/src/lib.rs
new file mode 100644
index 00000000..7d12d9af
--- /dev/null
+++ b/crates/revdb/src/lib.rs
@@ -0,0 +1,14 @@
+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}