diff --git a/mps/src/eventcom.h b/mps/src/eventcom.h
index 1d1732bed5b..f9e5280ba95 100644
--- a/mps/src/eventcom.h
+++ b/mps/src/eventcom.h
@@ -1,7 +1,7 @@
 /* impl.h.eventcom -- Event Logging Common Types
  *
  * Copyright (C) 1997 Harlequin Group, all rights reserved.
- * $HopeName: MMsrc!eventcom.h(trunk.6) $
+ * $HopeName: MMsrc!eventcom.h(trunk.7) $
  *
  * .readership: MPS developers.
  * .sources: mps.design.telemetry
@@ -76,5 +76,9 @@ typedef Word EventType;
 #define EventRootScan       ((EventType)0xEF625CA4) /* RooT SCAN */
 #define EventLabel          ((EventType)0xEF7ABE79) /* LABEL */
 #define EventTraceSegGreyen ((EventType)0xEF26A599) /* TRAce SeG Greyen */
+#define EventBufferReserve  ((EventType)0xEFB0FF6E) /* BUFFer REserve */
+#define EventBufferCommit   ((EventType)0xEFB0FFC0) /* BUFFer COmmit */
+#define EventBufferInit     ((EventType)0xEFB0FF14) /* BUFFer INit */
+#define EventBufferFinish   ((EventType)0xEFB0FFF1) /* BUFFer FInish */
 
 #endif /* eventcom_h */
diff --git a/mps/src/eventdef.h b/mps/src/eventdef.h
index b10968fc079..b8046b13db6 100644
--- a/mps/src/eventdef.h
+++ b/mps/src/eventdef.h
@@ -1,6 +1,6 @@
 /* impl.h.eventdef -- Event Logging Definitions
  *
- * $HopeName: MMsrc!eventdef.h(trunk.8) $
+ * $HopeName: MMsrc!eventdef.h(trunk.9) $
  * Copyright (C) 1997 Harlequin Group, all rights reserved.
  *
  * .readership: MPS developers.
@@ -108,3 +108,8 @@ RELATION(Intern                          , 0x0033, TRUE, User, WS)
 RELATION(Label                           , 0x0034, TRUE, User, AW)
 /* TraceStep is not really seg level event */
 RELATION(TraceStep                       , 0x0033, TRUE, Seg, PP)
+RELATION(BufferReserve                   , 0x0034, TRUE, Object, PAW)
+RELATION(BufferCommit                    , 0x0035, TRUE, Object, PAWW)
+/* BufferInit/Finish is not really pool level event */
+RELATION(BufferInit                      , 0x0036, TRUE, Pool, PPU)
+RELATION(BufferFinish                    , 0x0037, TRUE, Pool, P)