Add equation numbers in reference manual

[alexxy/gromacs.git] / docs / reference-manual / analysis / mean-square-displacement.rst

diff --git a/docs/reference-manual/analysis/mean-square-displacement.rst b/docs/reference-manual/analysis/mean-square-displacement.rst
index da21b56914701d9596c05cf19076596521d72b3f..268325b6307e820e10801926b7b71cbcadfb85e5 100644 (file)
--- a/docs/reference-manual/analysis/mean-square-displacement.rst
+++ b/docs/reference-manual/analysis/mean-square-displacement.rst
@@ -9,10 +9,9 @@ Mean Square Displacement
   particles of type :math:`A`, one can use the Einstein
   relation :ref:`108 <refAllen87>`:
 
-  .. math::
-
-     \lim_{t \rightarrow \infty} \langle
-     \|{\bf r}_i(t) - {\bf r}_i(0)\|^2 \rangle_{i \in A} ~=~ 6 D_A t
+  .. math:: \lim_{t \rightarrow \infty} \langle
+            \|{\bf r}_i(t) - {\bf r}_i(0)\|^2 \rangle_{i \in A} ~=~ 6 D_A t
+            :label: eqnmsd
 
 | This *mean square displacement* and :math:`D_A` are calculated by the
   program :ref:`gmx msd <gmx msd>`. Normally