diff --git a/fluegg/results.py b/fluegg/results.py
index f1ffa953d08ed7e0436c6f71588b5fd71833f9b4..81600812188525fb02c86ce82000cca44c18913f 100644
--- a/fluegg/results.py
+++ b/fluegg/results.py
@@ -328,6 +328,10 @@ class FullResults(Results):
         normalize : tuple of int, optional
             Normalize position array axes (the default is an empty,
             tuple, which doesn't normalize any axes).
+        time : float or None, optional
+            Simulation time, in seconds, for returned positions. If
+            time is None, positions at all simulation times are
+            returned.
 
         Returns
         -------