diff --git a/src/research.h b/src/research.h
index 8b13789..47c726e 100644
--- a/src/research.h
+++ b/src/research.h
@@ -1 +1,6 @@
+#ifndef RESEARCH_H
+#define RESEARCH_H
 
+int research (void);		// cluster detection
+
+#endif