diff --git a/range-diff.h b/range-diff.h
new file mode 100644
index 0000000..7b6eef3
--- /dev/null
+++ b/range-diff.h
@@ -0,0 +1,7 @@
+#ifndef RANGE_DIFF_H
+#define RANGE_DIFF_H
+
+int show_range_diff(const char *range1, const char *range2,
+		    int creation_factor);
+
+#endif