diff --git a/sensors/discover.py b/sensors/discover.py
new file mode 100644
index 0000000..f227043
--- /dev/null
+++ b/sensors/discover.py
@@ -0,0 +1,9 @@
+all_sensors = {}
+
+
+def provides(sensor_class_name):
+    def closure(func):
+        assert sensor_class_name not in all_sensors
+        all_sensors[sensor_class_name] = func
+        return func
+    return closure