diff --git a/src/division/division.h b/src/division/division.h
index 8b13789..bce87a4 100644
--- a/src/division/division.h
+++ b/src/division/division.h
@@ -1 +1,7 @@
+#ifndef division_H
+#define division_H
+
+int divide(float dividend, float divisor);
+
+#endif