diff --git a/include/engine/map_matching/bayes_classifier.hpp b/include/engine/map_matching/bayes_classifier.hpp
index 59b9fb5ae..c77fa843e 100644
--- a/include/engine/map_matching/bayes_classifier.hpp
+++ b/include/engine/map_matching/bayes_classifier.hpp
@@ -22,7 +22,7 @@ struct NormalDistribution
     {
     }
 
-    // FIXME implement log-probability version since its faster
+    // FIXME implement log-probability version since it's faster
     double density_function(const double val) const
     {
         using namespace boost::math::constants;
@@ -43,7 +43,7 @@ struct LaplaceDistribution
     {
     }
 
-    // FIXME implement log-probability version since its faster
+    // FIXME implement log-probability version since it's faster
     double density_function(const double val) const
     {
         const double x = std::abs(val - location);
diff --git a/include/engine/plugins/match.hpp b/include/engine/plugins/match.hpp
index 0de44148a..23b113b26 100644
--- a/include/engine/plugins/match.hpp
+++ b/include/engine/plugins/match.hpp
@@ -46,7 +46,7 @@ template <class DataFacadeT> class MapMatchingPlugin : public BasePlugin
     MapMatchingPlugin(DataFacadeT *facade, const int max_locations_map_matching)
         : descriptor_string("match"), facade(facade),
           max_locations_map_matching(max_locations_map_matching),
-          // the values where derived from fitting a laplace distribution
+          // the values were derived from fitting a laplace distribution
           // to the values of manually classified traces
           classifier(map_matching::LaplaceDistribution(0.005986, 0.016646),
                      map_matching::LaplaceDistribution(0.054385, 0.458432),