diff --git a/guppylang/engine.py b/guppylang/engine.py
index c0b986b0b..4c712b83b 100644
--- a/guppylang/engine.py
+++ b/guppylang/engine.py
@@ -237,6 +237,10 @@ def compile(self, id: DefId) -> ModulePointer:
             }
             for ext in all_used_extensions
         ]
+        graph.hugr.module_root.metadata["__generator"] = {
+            "name": "guppylang",
+            "version": guppylang.__version__,
+        }
         return ModulePointer(Package(modules=[graph.hugr], extensions=extensions), 0)
 
 
diff --git a/tests/test_version_metadata.py b/tests/test_version_metadata.py
new file mode 100644
index 000000000..2afabb970
--- /dev/null
+++ b/tests/test_version_metadata.py
@@ -0,0 +1,10 @@
+from guppylang import guppy, __version__
+
+def test_metadata():
+    @guppy
+    def foo() -> None:
+        pass
+
+    hugr = foo.compile().module
+    assert hugr.module_root.metadata["__generator"]["name"] == "guppylang"
+    assert hugr.module_root.metadata["__generator"]["version"] == __version__