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diff --git a/compiler/prelude/primops.txt.pp b/compiler/prelude/primops.txt.pp
index 0af4c88..a0b991f 100644
--- a/compiler/prelude/primops.txt.pp
+++ b/compiler/prelude/primops.txt.pp
@@ -1,8 +1,12 @@
 -----------------------------------------------------------------------
--- $Id: primops.txt.pp,v 1.37 2005/11/25 09:46:19 simonmar Exp $
+-- 
+-- (c) 2010 The University of Glasgow
 --
 -- Primitive Operations and Types
 --
+-- For more information on PrimOps, see
+--   http://hackage.haskell.org/trac/ghc/wiki/Commentary/PrimOps
+--
 -----------------------------------------------------------------------
 
 -- This file is processed by the utility program genprimopcode to produce
@@ -11,25 +15,10 @@
 --
 -- It should first be preprocessed.
 --
--- To add a new primop, you currently need to update the following files:
---
---	- this file (ghc/compiler/prelude/primops.txt.pp), which includes
---	  the type of the primop, and various other properties (its
---	  strictness attributes, whether it is defined as a macro
---	  or as out-of-line code, etc.)
---
---	- if the primop is inline (i.e. a macro), then:
---	  	ghc/compiler/AbsCUtils.lhs (dscCOpStmt)
---		  defines the translation of the primop into simpler
---		  abstract C operations.
---		
---	- or, for an out-of-line primop:
---	        ghc/includes/StgMiscClosures.h (just add the declaration)
---		ghc/rts/PrimOps.cmm     (define it here)
---		ghc/rts/Linker.c       (declare the symbol for GHCi)
---
---	- the User's Guide 
+-- Information on how PrimOps are implemented and the steps necessary to
+-- add a new one can be found in the Commentary:
 --
+--  http://hackage.haskell.org/trac/ghc/wiki/Commentary/PrimOps
 
 -- This file is divided into named sections, each containing or more
 -- primop entries. Section headers have the format:
@@ -632,14 +621,15 @@ primop  UnsafeThawArrayOp  "unsafeThawArray#" GenPrimOp
 ------------------------------------------------------------------------
 section "Byte Arrays"
 	{Operations on {\tt ByteArray\#}. A {\tt ByteArray\#} is a just a region of
-         raw memory in the garbage-collected heap, which is not scanned
-         for pointers. It carries its own size (in bytes). There are
-	 three sets of operations for accessing byte array contents:
-	 index for reading from immutable byte arrays, and read/write
-	 for mutable byte arrays.  Each set contains operations for 
-	 a range of useful primitive data types.  Each operation takes	
-	 an offset measured in terms of the size fo the primitive type
-	 being read or written.}
+         raw memory in the garbage-collected heap, which is not
+         scanned for pointers. It carries its own size (in bytes).
+         There are
+         three sets of operations for accessing byte array contents:
+         index for reading from immutable byte arrays, and read/write
+         for mutable byte arrays.  Each set contains operations for a
+         range of useful primitive data types.  Each operation takes
+         an offset measured in terms of the size fo the primitive type
+         being read or written.}
 
 ------------------------------------------------------------------------
 
@@ -681,10 +671,11 @@ primop  UnsafeFreezeByteArrayOp "unsafeFreezeByteArray#" GenPrimOp
 
 primop  SizeofByteArrayOp "sizeofByteArray#" GenPrimOp  
    ByteArray# -> Int#
+   {Return the size of the array in bytes.}
 
 primop  SizeofMutableByteArrayOp "sizeofMutableByteArray#" GenPrimOp
    MutableByteArray# s -> Int#
-
+   {Return the size of the array in bytes.}
 
 primop IndexByteArrayOp_Char "indexCharArray#" GenPrimOp
    ByteArray# -> Int# -> Char#
@@ -1156,21 +1147,28 @@ primop  RaiseIOOp "raiseIO#" GenPrimOp
    out_of_line = True
    has_side_effects = True
 
-primop  BlockAsyncExceptionsOp "blockAsyncExceptions#" GenPrimOp
+primop  MaskAsyncExceptionsOp "maskAsyncExceptions#" GenPrimOp
         (State# RealWorld -> (# State# RealWorld, a #))
      -> (State# RealWorld -> (# State# RealWorld, a #))
    with
    out_of_line = True
    has_side_effects = True
 
-primop  UnblockAsyncExceptionsOp "unblockAsyncExceptions#" GenPrimOp
+primop  MaskUninterruptibleOp "maskUninterruptible#" GenPrimOp
         (State# RealWorld -> (# State# RealWorld, a #))
      -> (State# RealWorld -> (# State# RealWorld, a #))
    with
    out_of_line = True
    has_side_effects = True
 
-primop  AsyncExceptionsBlockedOp "asyncExceptionsBlocked#" GenPrimOp
+primop  UnmaskAsyncExceptionsOp "unmaskAsyncExceptions#" GenPrimOp
+        (State# RealWorld -> (# State# RealWorld, a #))
+     -> (State# RealWorld -> (# State# RealWorld, a #))
+   with
+   out_of_line = True
+   has_side_effects = True
+
+primop  MaskStatus "getMaskingState#" GenPrimOp
         State# RealWorld -> (# State# RealWorld, Int# #)
    with
    out_of_line = True
@@ -1546,6 +1544,13 @@ primop GetSparkOp "getSpark#" GenPrimOp
    has_side_effects = True
    out_of_line = True
 
+primop NumSparks "numSparks#" GenPrimOp
+   State# s -> (# State# s, Int# #)
+   { Returns the number of sparks in the local spark pool. }
+   with
+   has_side_effects = True
+   out_of_line = True
+
 -- HWL: The first 4 Int# in all par... annotations denote:
 --   name, granularity info, size of result, degree of parallelism
 --      Same  structure as _seq_ i.e. returns Int#
@@ -1769,6 +1774,16 @@ pseudoop   "unsafeCoerce#"
 -- the wrapper had type () -> (), and hence the wrapper de-constructed the (), the worker re-constructed
 -- a new (), with the result that the code ended up with "case () of (a,b) -> ...".
 
+primop  TraceEventOp "traceEvent#" GenPrimOp
+   Addr# -> State# s -> State# s
+   { Emits an event via the RTS tracing framework.  The contents
+     of the event is the zero-terminated byte string passed as the first
+     argument.  The event will be emitted either to the .eventlog file,
+     or to stderr, depending on the runtime RTS flags. }
+   with
+   has_side_effects = True
+   out_of_line      = True
+
 ------------------------------------------------------------------------
 ---                                                                  ---
 ------------------------------------------------------------------------