diff --git a/include/elf.h b/include/elf.h
index f30ef264b7f4..c094a1c78837 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -26,6 +26,10 @@
  * $FreeBSD$
  */
 
+/*
+ * This is a Solaris compatibility header
+ */
+
 #ifndef	_ELF_H_
 #define	_ELF_H_