diff --git a/km3io/daq.py b/km3io/daq.py
index 2e30ed0f2dff113ff7522c22dde2ced4fd36027f..22d17f454c6514e761b8ce003816238e79c49655 100644
--- a/km3io/daq.py
+++ b/km3io/daq.py
@@ -56,7 +56,13 @@ def get_udp_max_sequence_number(value):
 
 
 def has_udp_trailer(value):
-    """Returns the UDP Trailer flag (fifo)"""
+    """Returns the UDP Trailer flag (fifo)
+
+    Parameters
+    ----------
+    value : int32
+        The integer value to be parsed.
+    """
     return np.any(np.bitwise_and(value, np.left_shift(1, 31)))