diff --git a/proto/units.proto b/proto/units.proto
new file mode 100644
index 0000000..5a62d99
--- /dev/null
+++ b/proto/units.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package weather;
+
+option go_package = "codeberg.org/andcscott/OpenWeatherMap-gRPC-API/proto";
+
+enum Units {
+  UNITS_UNSPECIFIED = 0;
+  UNITS_STANDARD = 1;
+  UNITS_METRIC = 2;
+  UNITS_IMPERIAL = 3;
+}