update selections.rst

MDAnalysis · Jun 1, 2022 · e7d6a68 · e7d6a68
1 parent e38e219
commit e7d6a68
Showing 1 changed file with 7 additions and 6 deletions.
diff --git a/package/doc/sphinx/source/documentation_pages/selections.rst b/package/doc/sphinx/source/documentation_pages/selections.rst
@@ -173,12 +173,13 @@ smarts *SMARTS-query*
     RDKit's `GetSubstructMatches
     <https://www.rdkit.org/docs/source/rdkit.Chem.rdchem.html#rdkit.Chem.rdchem.Mol.GetSubstructMatches>`_.
     By default, the `useChirality` kwarg in ``rdkit_kwargs`` is set to true
-    and maxMatches in ``smarts_kwargs`` is ``10 * len(AtomGroup)`` or
-    ``10 * len(Universe.atoms)``, whichever is applicable.
-    Note that the number of matches can occasionally exceed the default
-    value of maxMatches, causing too few atoms to be returned. If this
-    occurs, a warning will be issued. The problem can be fixed by increasing
-    the value of maxMatches. This behavior may be updated in the future.
+    and maxMatches in ``smarts_kwargs`` is ``max(1000, 10 * n_atoms)``, where
+    ``n_atoms`` is either ``len(AtomGroup)`` or ``len(Universe.atoms)``,
+    whichever is applicable. Note that the number of matches can occasionally
+    exceed the default value of maxMatches, causing too few atoms to be
+    returned. If this occurs, a warning will be issued. The problem can be
+    fixed by increasing the value of maxMatches. This behavior may be updated
+    in the future
 
 chiral *R | S*
     select a particular stereocenter. e.g. ``name C and chirality S``