Add equation numbers in reference manual

[alexxy/gromacs.git] / docs / reference-manual / algorithms / expanded-ensemble.rst

diff --git a/docs/reference-manual/algorithms/expanded-ensemble.rst b/docs/reference-manual/algorithms/expanded-ensemble.rst
index a753bf608e3675874cfc757c74b5c072c49972ed..4513716f81d5491642b29da278ecf7cd54dcebf9 100644 (file)
--- a/docs/reference-manual/algorithms/expanded-ensemble.rst
+++ b/docs/reference-manual/algorithms/expanded-ensemble.rst
@@ -7,6 +7,7 @@ variables that can be sampled over. The probability of any given state
 can be written as:
 
 .. math:: P(\vec{x},k) \propto \exp\left(-\beta_k U_k + g_k\right),
+          :label: eqnexpandensemble
 
 where :math:`\beta_k = \frac{1}{k_B T_k}` is the :math:`\beta`
 corresponding to the :math:`k`\ th thermodynamic state, and :math:`g_k`