diff --git a/brouter-routing-app/src/main/aidl/btools/routingapp/IBRouterService.aidl b/brouter-routing-app/src/main/aidl/btools/routingapp/IBRouterService.aidl
index ee9c406..bfd2f81 100644
--- a/brouter-routing-app/src/main/aidl/btools/routingapp/IBRouterService.aidl
+++ b/brouter-routing-app/src/main/aidl/btools/routingapp/IBRouterService.aidl
@@ -34,7 +34,7 @@ interface IBRouterService {
     //  "timode"          = turnInstructionMode [0=none, 1=auto-choose, 2=locus-style, 3=osmand-style, 4=comment-style, 5=gpsies-style, 6=orux-style, 7=locus-old-style] default 0
     //  "heading"         = angle (optional to give a route a start direction)
     //  "direction"       = angle (optional, used like "heading" on a recalculation request by Locus as start direction)
-    //  "engineMode"      = 0 (optional, no more modes defined at the moment)
+    //  "engineMode"      = 0 (optional, default 0, 2 = get elevation)
 
     // return null if all ok and no path given, the track if ok and path given, an error message if it was wrong
     //        the resultas string when 'pathToFileResult' is null, this should be default when Android Q or later
diff --git a/docs/developers/android_service.md b/docs/developers/android_service.md
index 52159a7..36da40c 100644
--- a/docs/developers/android_service.md
+++ b/docs/developers/android_service.md
@@ -44,3 +44,10 @@ This parameters are needed to tell BRouter what to do.
 Profile parameters affect the result of a profile.
 For the app it is a list of params concatenated by '&'. E.g. extraParams=avoidferry=1&avoidsteps=0
 The server calls profile params by a prefix 'profile:'. E.g. ...&profile:avoidferry=1&profile:avoidsteps=0
+
+
+## other routing engine modes in app
+
+### get elevation
+
+"engineMode=2" allows a client to only request an elevation for a point. This can be restricted with "waypointCatchingRange".
diff --git a/docs/revisions.md b/docs/revisions.md
index 34f589b..d30070d 100644
--- a/docs/revisions.md
+++ b/docs/revisions.md
@@ -10,7 +10,7 @@ Android
 
 Library
 
-- Add engineMode for future use
+- Add new function 'get elevation'
 - Minor bug fixes