diff --git a/pcbnew/router/pns_diff_pair.cpp b/pcbnew/router/pns_diff_pair.cpp
index e6e1019aa6..695ff0364e 100644
--- a/pcbnew/router/pns_diff_pair.cpp
+++ b/pcbnew/router/pns_diff_pair.cpp
@@ -403,7 +403,7 @@ void DP_GATEWAYS::FilterByOrientation ( int aAngleMask, DIRECTION_45 aRefOrienta
     m_gateways.erase(
         std::remove_if( m_gateways.begin(), m_gateways.end(), [aAngleMask, aRefOrientation]( const DP_GATEWAY& dp) {
             DIRECTION_45 orient( dp.AnchorP() - dp.AnchorN() );
-            return !( orient.Angle( aRefOrientation ) & aAngleMask );
+            return ( orient.Angle( aRefOrientation ) & aAngleMask );
         } ), m_gateways.end()
     );
 }
diff --git a/pcbnew/router/pns_diff_pair_placer.cpp b/pcbnew/router/pns_diff_pair_placer.cpp
index 8a33d333fb..022f36f927 100644
--- a/pcbnew/router/pns_diff_pair_placer.cpp
+++ b/pcbnew/router/pns_diff_pair_placer.cpp
@@ -661,14 +661,20 @@ bool DIFF_PAIR_PLACER::routeHead( const VECTOR2I& aP )
         m_prevPair->CursorOrientation( fp, midp, dirV );
 
         VECTOR2I fpProj = SEG( midp, midp + dirV ).LineProject( fp );
+
+        // compute 'leader point' distance from the cursor (project cursor position
+        // on the extension of the starting segment pair of the DP)
         int lead_dist = ( fpProj - fp ).EuclideanNorm();
 
         gwsTarget.SetFitVias( m_placingVia, m_sizes.ViaDiameter(), viaGap() );
 
+        // far from the initial segment extension line -> allow a 45-degree obtuse turn
         if( lead_dist > m_sizes.DiffPairGap() + m_sizes.DiffPairWidth() )
         {
             gwsTarget.BuildForCursor( fp );
         }
+        // close to the initial segment extension line -> keep straight part only, project as close
+        // as possible to the cursor
         else
         {
             gwsTarget.BuildForCursor( fpProj );