diff --git a/OsmAnd-java/src/main/java/net/osmand/router/RouteResultPreparation.java b/OsmAnd-java/src/main/java/net/osmand/router/RouteResultPreparation.java
index 44c48f69ec..26d984b2da 100644
--- a/OsmAnd-java/src/main/java/net/osmand/router/RouteResultPreparation.java
+++ b/OsmAnd-java/src/main/java/net/osmand/router/RouteResultPreparation.java
@@ -1216,6 +1216,12 @@ public class RouteResultPreparation {
 		TurnType t = TurnType.getExitTurn(exit, 0, leftSide);
 		// usually covers more than expected
 		float turnAngleBasedOnOutRoads = (float) MapUtils.degreesDiff(last.getBearingBegin(), prev.getBearingEnd());
+		// Angle based on circle method tries 
+		// 1. to calculate antinormal to roundabout circle on roundabout entrance and 
+		// 2. normal to roundabout circle on roundabout exit
+		// 3. calculate angle difference
+		// This method doesn't work if you go from S to N touching only 1 point of roundabout, 
+		// but it is very important to identify very sharp or very large angle to understand did you pass whole roundabout or small entrance
 		float turnAngleBasedOnCircle = (float) -MapUtils.degreesDiff(firstRoundabout.getBearingBegin(), lastRoundabout.getBearingEnd() + 180);
 		if (Math.abs(turnAngleBasedOnOutRoads) > 120) {
 			// correctly identify if angle is +- 180, so we approach from left or right side