diff --git a/include/ChangeLog b/include/ChangeLog
index 180a73915f4c54b7c811c9c8433d5f52cd3821be..8b46056ce3128867c766b1d28be8335033c6fce0 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,9 @@
+2016-05-26  Chung-Lin Tang  <cltang@codesourcery.com>
+
+	* gomp-constants.h (GOMP_VERSION): Increment to 1, add comment to
+	describe the need for incrementing this macro whenever the plugin
+	interface is modified.
+
 2016-04-29  Tom Tromey  <tom@tromey.com>
 
 	* dwarf2.h (enum dwarf_source_language) <DW_LANG_Rust,
diff --git a/include/gomp-constants.h b/include/gomp-constants.h
index e31c2e00364b8a74218797ad0edbd8485a10d74d..9bc9fa5c3a97849f0a4f6bf98a382880fa9b3b9b 100644
--- a/include/gomp-constants.h
+++ b/include/gomp-constants.h
@@ -196,8 +196,10 @@ enum gomp_map_kind
 /* Internal to libgomp.  */
 #define GOMP_TARGET_FLAG_UPDATE		(1U << 31)
 
-/* Versions of libgomp and device-specific plugins.  */
-#define GOMP_VERSION	0
+/* Versions of libgomp and device-specific plugins.  GOMP_VERSION
+   should be incremented whenever an ABI-incompatible change is introduced
+   to the plugin interface defined in libgomp/libgomp.h.  */
+#define GOMP_VERSION	1
 #define GOMP_VERSION_NVIDIA_PTX 1
 #define GOMP_VERSION_INTEL_MIC 0
 #define GOMP_VERSION_HSA 0