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diff --git a/compiler/codeGen/StgCmmMonad.hs b/compiler/codeGen/StgCmmMonad.hs
index dbcb540..f1823bd 100644 (file)
--- a/compiler/codeGen/StgCmmMonad.hs
+++ b/compiler/codeGen/StgCmmMonad.hs
@@ -260,7 +260,9 @@ data CgState
 data HeapUsage =
   HeapUsage {
        virtHp :: VirtualHpOffset,      -- Virtual offset of highest-allocated word
+                                       --   Incremented whenever we allocate
        realHp :: VirtualHpOffset       -- realHp: Virtual offset of real heap ptr
+                                       --   Used in instruction addressing modes
   }
 
 type VirtualHpOffset = WordOff