diff --git a/docs/developers/android_service.md b/docs/developers/android_service.md
index 88ea3d3..7561f12 100644
--- a/docs/developers/android_service.md
+++ b/docs/developers/android_service.md
@@ -136,3 +136,13 @@ This suppress the first question after installation for the BRouter path, genera
 ### get info
 
 "engineMode=3" allows a client to request the description tags for  a segment. This can be restricted with "waypointCatchingRange".
+
+### round trip
+
+"engineMode=4" generate routes returning to the start point.
+This needs some parameter:
+- roundTripDistance - in meters, how far to generate some helping points (default 1500)
+- direction - in degree, the direction to the points (default -1, BRouter uses a random direction)
+- roundTripPoints - how many helping point (default 5, 4 around the distance and one end point)
+
+When direction = -1 and with a selection of the profile parameter consider_elevation, consider_forest or consider_river  BRouter collects the information about this from the area defined in roundTripDistance and selects a random direction from the quadrant with the best choice of the values. Please keep in mind that the longer the distance, the longer this will take.
diff --git a/docs/developers/profile_developers_guide.md b/docs/developers/profile_developers_guide.md
index d85ad05..fe47966 100644
--- a/docs/developers/profile_developers_guide.md
+++ b/docs/developers/profile_developers_guide.md
@@ -145,6 +145,18 @@ Some variable names are pre-defined and accessed by the routing engine:
        New is an additional block with information on the excluded ways, a list with
        name `noStartWay` and `name,value;...` entries.
 
+    - `correctMisplacedViaPoints`  default = true
+
+       Searches for incorrectly placed via points and removes the detours.
+       With the parameter `exportCorrectedWaypoints` adds these points to the output formats.
+
+    - `correctMisplacedViaPointsDistance`  default=0
+
+       The default setting 0 removes the entire path, with a tolerance limit BRouter finds and removes only paths within this distance.
+
+    - `continueStraight` default = false
+
+       After a via point this goes on in the straight direction. This could avoid u-turns on misplaced via points.
 
 
 - for the way section these are