diff --git a/mcmc/mcmc_root_finder_vertex.py b/mcmc/mcmc_root_finder_vertex.py
index 50813f6..0752f22 100644
--- a/mcmc/mcmc_root_finder_vertex.py
+++ b/mcmc/mcmc_root_finder_vertex.py
@@ -30,6 +30,7 @@
     import AbstractGeneratesDataSpecification
 from spinn_front_end_common.interface.ds import DataSpecificationGenerator
 
+
 class MCMCRootFinderRegions(Enum):
     """ Regions in the MCMCRootFinder Data
     """