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-rw-r--r--CmdLine/Usage.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/CmdLine/Usage.hs b/CmdLine/Usage.hs
index 1d0bba954..6e0a1ca80 100644
--- a/CmdLine/Usage.hs
+++ b/CmdLine/Usage.hs
@@ -93,6 +93,8 @@ paramFormat :: String
paramFormat = "FORMAT"
paramFile :: String
paramFile = "FILE"
+paramRef :: String
+paramRef = "REF"
paramGroup :: String
paramGroup = "GROUP"
paramExpression :: String