diff --git a/include/rail.h b/include/rail.h
index 02f237d..bc55e32 100644
--- a/include/rail.h
+++ b/include/rail.h
@@ -40,4 +40,6 @@ rail_node_t *FindNode(int id);
 
 int add(int a, int b);
 
+int power(int a, int b);
+
 #endif //AUTO_PILOT_BUS_RAIL_H
diff --git a/src/rail.c b/src/rail.c
index 0dd3efd..a73e926 100644
--- a/src/rail.c
+++ b/src/rail.c
@@ -5,4 +5,9 @@ rail_node_t *rails;
 int add(int a, int b)
 {
     return a+ b;
+}
+
+int power(int a, int b)
+{
+    return a*b;
 }
\ No newline at end of file