1 files changed, 3 insertions, 0 deletions
diff --git a/compat.py b/compat.py
index bc4c1c2..5529247 100644
--- a/compat.py
+++ b/compat.py
@@ -251,6 +251,9 @@ def check_anchorname_char(ch):
 
 def version_tnf(t1, t2=None):
     # type: (Any, Any) -> Any
+    """
+    return True if ruamel.yaml version_info < t1, None if t2 is specified and bigger else False
+    """
     from ruamel.yaml import version_info  # NOQA
 
     if version_info < t1: