diff --git a/packages/CLPBN/horus/HorusCli.cpp b/packages/CLPBN/horus/HorusCli.cpp
index 0997e4655..9a0fb7a3a 100644
--- a/packages/CLPBN/horus/HorusCli.cpp
+++ b/packages/CLPBN/horus/HorusCli.cpp
@@ -16,8 +16,8 @@ VarIds readQueryAndEvidence (FactorGraph&, int, const char* [], int);
 
 void runSolver (const FactorGraph&, const VarIds&);
 
-const string USAGE = "usage: ./hcli [HORUS_FLAG=VALUE] \
-MODEL_FILE [VARIABLE | OBSERVED_VARIABLE=EVIDENCE] ..." ;
+const string USAGE = "usage: ./hcli \
+[<KEY>=<VALUE>]... <FILE> [<VAR>|<VAR>=<EVIDENCE>]..." ;
 
 
 int