diff --git a/run/main.c b/run/main.c
index bda132f..04f9ee2 100644
--- a/run/main.c
+++ b/run/main.c
@@ -6,7 +6,7 @@
 #define   MAXWARNCODE    99      
 /* text copied here, no more need of include "text.h" */
 #define FMT01  "\nEPANET Version %d.%d.%d"
-#define FMT03  "\n Correct syntax is:\n %s <input file> <output file>\n"
+#define FMT03 "\n Correct syntax is:\n\n\t %s <input file> <report file> <binary output file (optional)>\n"
 #define FMT09  "\n\nEPANET completed."
 #define FMT10  "\nEPANET completed. There are warnings."
 #define FMT11  "\nEPANET completed. There are errors."
diff --git a/src/text.h b/src/text.h
index 85159a9..ff12ecd 100755
--- a/src/text.h
+++ b/src/text.h
@@ -340,7 +340,7 @@ AUTHOR:     L. Rossman
 "******************************************************************"
 #define FMT01  "\n... EPANET Version %d.%d\n"
 #define FMT02  "\n  o Retrieving network data"
-#define FMT03  "\n Correct syntax is:\n %s <input file> <output file>\n"
+#define FMT03 "\n Correct syntax is:\n\n\t %s <input file> <report file> <binary output file (optional)>\n"
 #define FMT04  "\n    Cannot use duplicate file names."
 #define FMT05  "\n    Cannot open input file "
 #define FMT06  "\n    Cannot open report file "