diff --git a/zeratool_lib/zeratool_lib.py b/zeratool_lib/zeratool_lib.py
index 9841aeb..35a4fe8 100755
--- a/zeratool_lib/zeratool_lib.py
+++ b/zeratool_lib/zeratool_lib.py
@@ -34,6 +34,8 @@
 
 
 class ZeratoolInputStreams(Enum):
+    """Sync names with commons.input_streams.InputStreams."""
+
     STDIN = "STDIN"
     ARGUMENTS = "ARG"