diff --git a/src/lib.rs b/src/lib.rs
index 7e83a15..83bc4c6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 mod cnpj;
 mod cpf;
 mod pis;
+mod rg;
 
 use pgx::prelude::*;
 
diff --git a/src/rg.rs b/src/rg.rs
new file mode 100644
index 0000000..06081a3
--- /dev/null
+++ b/src/rg.rs
@@ -0,0 +1,15 @@
+use pgx::{opname, pg_operator, prelude::*, Aggregate};
+
+// https://pt.wikipedia.org/wiki/C%C3%A9dula_de_identidade
+
+extension_sql!(
+    "\
+CREATE TYPE rg AS (
+    number bigint,
+    digito char(1),
+    estado char(2)
+);",
+    name = "create_composites",
+    bootstrap
+);
+