diff --git a/src/codemodder/cli.py b/src/codemodder/cli.py
index efc89fbb..a48fa7de 100644
--- a/src/codemodder/cli.py
+++ b/src/codemodder/cli.py
@@ -139,7 +139,7 @@ def parse_args(argv, codemod_registry):
         "--log-format",
         type=OutputFormat,
         default=OutputFormat.HUMAN,
-        choices=[str(x).split(".")[-1].lower() for x in list(OutputFormat)],
+        choices=[OutputFormat.HUMAN, OutputFormat.JSON],
         help="the format for the log output",
     )
     parser.add_argument(
diff --git a/src/codemodder/logging.py b/src/codemodder/logging.py
index 7a050d0d..5590b9dd 100644
--- a/src/codemodder/logging.py
+++ b/src/codemodder/logging.py
@@ -13,6 +13,10 @@ class OutputFormat(Enum):
     HUMAN = "human"
     JSON = "json"
 
+    def __str__(self):
+        """For rendering properly in argparse help."""
+        return self.value.lower()
+
 
 def log_section(section_name: str):
     """