1 files changed, 6 insertions, 0 deletions
diff --git a/netlib/utils.py b/netlib/utils.py
index 6fed44b6..799b0d42 100644
--- a/netlib/utils.py
+++ b/netlib/utils.py
@@ -141,6 +141,12 @@ _label_valid = re.compile(b"(?!-)[A-Z\d-]{1,63}(?<!-)$", re.IGNORECASE)
 
 
 def is_valid_host(host):
+    """
+    Checks if a hostname is valid.
+
+    Args:
+      host (bytes): The hostname
+    """
     try:
         host.decode("idna")
     except ValueError: