Fix rief1997 footnote in hooke.experiment.VelocityClamp

diff --git a/hooke/experiment.py b/hooke/experiment.py
index 22ed8d2c4c2f1b6942a0e25f24451030d898b283..9f944888caf62a7f2cc52d40c68819891261741f 100644 (file)
--- a/hooke/experiment.py
+++ b/hooke/experiment.py
@@ -41,7 +41,7 @@ class ForceClamp (Experiment):
 class VelocityClamp (Experiment):
     """Constant piezo velocity force spectroscopy [#rief1997]_.
     
-    .. [#rief1997]: M. Rief, M. Gautel, F. Oesterhelt, J.M. Fernandez,
+    .. [#rief1997] M. Rief, M. Gautel, F. Oesterhelt, J.M. Fernandez,
       H.E. Gaub.
       "Reversible Unfolding of Individual Titin Immunoglobulin Domains by AFM."
       Science, 1997.