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-rw-r--r--compiler/GHC/Cmm/MachOp.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/GHC/Cmm/MachOp.hs b/compiler/GHC/Cmm/MachOp.hs
index 7004fece51..cd2d331a58 100644
--- a/compiler/GHC/Cmm/MachOp.hs
+++ b/compiler/GHC/Cmm/MachOp.hs
@@ -102,6 +102,8 @@ data MachOp
| MO_Or Width
| MO_Xor Width
| MO_Not Width
+
+ -- Shifts. The shift amount must be in [0,widthInBits).
| MO_Shl Width
| MO_U_Shr Width -- unsigned shift right
| MO_S_Shr Width -- signed shift right