diff --git a/rflint/rflint.py b/rflint/rflint.py
index 8355fd9..8dca4c9 100644
--- a/rflint/rflint.py
+++ b/rflint/rflint.py
@@ -257,7 +257,7 @@ def parse_and_process_args(self, args):
                 "rules except DuplicateTestNames.\n"
                 "\n"
                 "FORMAT is a string that performs a substitution on the following \n"
-                "patterns: {severity}, {linenumber}, {char}, {message}, and {rulename}.\n"
+                "patterns: {filename}, {severity}, {linenumber}, {char}, {message} and {rulename}.\n"
                 "\n"
                 "For example: --format 'line: {linenumber}: message: {message}'. \n"
                 "\n"