diff --git a/clock.h b/clock.h
new file mode 100644
index 0000000..1e97fc4
--- /dev/null
+++ b/clock.h
@@ -0,0 +1,7 @@
+#pragma once
+
+// This is a stub only - delays may be implemented in some more suitable way
+
+// in the project where this comes from, timebase was generated by systick.
+
+void delay_ms(uint32_t ms);