diff --git a/docs/developers/android_service.md b/docs/developers/android_service.md
index 0feaddf..5bbc475 100644
--- a/docs/developers/android_service.md
+++ b/docs/developers/android_service.md
@@ -39,19 +39,52 @@ Please note: when they have a parameter 'weight' the result is not an absolute n
 
 This parameters are needed to tell BRouter what to do.
 
+### using profiles
+
+For calulation BRouter uses a set of rules defined in a profile. See description of profile [rules](https://github.com/abrensch/brouter/blob/master/docs/developers/profile_developers_guide.md).
+
+Here we talk about how we let BRouter know witch profile to use.
+There are three ways:
+
+1. use the parameter 'v' and 'fast'
+```
+   "v"-->[motorcar|bicycle|foot]
+   "fast"-->[0|1]
+   This enables BRouter to look into the file serviceconfig.dat.
+   In there BRouter find the profile associated for e.g bicyle_fast trekking
+   This could be changed by the user calling the BRouter app server-mode.
+```
+
+2. use the profile parameter
+```
+   profile=trekking
+   It needs an available file in the BRouter profile folder e.g. trekking.brf
+```
+
+3. use a remote profile
+```
+   remoteProfile=a long string with routing rules
+   This is saved in BRouter profile folder temporary with the file name 'remote.brf'
+```
+
+
 ### profile parameter
 
 Profile parameters affect the result of a profile.
+The variables inside a profile predefine a value e.g. avoidsteps=1
+A parameter call gives the chance to change this start value without changing the profile e.g. avoidsteps=0
 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
 
+By using this parameter logic, there is no need to edit a profile before sending.
+
 ### using profile parameter inside an app
 
 To be flexible it is possible to send a profile to BRouter - server or app.
 
 Another variant is to send parameters for an existing profile that are different from the original profile.
 
-With the version  1.7.1 it is possible to collect parameters from the profile. 
+With the version  1.7.1 it is possible to collect parameters from the profile.
 The variable parameters are defined like this
 ```
 assign avoid_path            = false  # %avoid_path% | Set to true to avoid pathes | boolean
@@ -61,9 +94,9 @@ Now you could do that with an calling app.
 
 What to do to get it work?
 
-- First copy the [RoutingParam](brouter-routing-app/src/main/java/btools/routingapp/RoutingParam.java) class to your source - use the same name and package name. 
+- First copy the [RoutingParam](brouter-routing-app/src/main/java/btools/routingapp/RoutingParam.java) class to your source - use the same name and package name.
 - Second analyze the profile for which you need the parameter.
-  This [BRouter routine](https://github.com/abrensch/brouter/blob/086503e529da7c044cc0f88f86c394fdb574d6cf/brouter-routing-app/src/main/java/btools/routingapp/RoutingParameterDialog.java#L103) can do that, just copy it to your source to use it in your app. 
+  This [BRouter routine](https://github.com/abrensch/brouter/blob/086503e529da7c044cc0f88f86c394fdb574d6cf/brouter-routing-app/src/main/java/btools/routingapp/RoutingParameterDialog.java#L103) can do that, just copy it to your source to use it in your app.
   It builds a List<RoutingParam> you could send to BRouter app.
 - You find the call of BRouter app in comment at [RoutingParameterDialog](https://github.com/abrensch/brouter/blob/086503e529da7c044cc0f88f86c394fdb574d6cf/brouter-routing-app/src/main/java/btools/routingapp/RoutingParameterDialog.java#L33)
 
@@ -79,7 +112,7 @@ intent.putExtra("runsilent", true);
 startActivity(intent);
 ```
 
-This suppress the first question after installation for the BRouter path, generates the BRouter folders in main space  and starts the download dialog. 
+This suppress the first question after installation for the BRouter path, generates the BRouter folders in main space  and starts the download dialog.
 
 ### silent app call
 
@@ -92,7 +125,7 @@ intent.putExtra("runsilent", true);
 startActivity(intent);
 ```
 
-This suppress the first question after installation for the BRouter path, generates the BRouter folders in main space  and starts the download dialog. 
+This suppress the first question after installation for the BRouter path, generates the BRouter folders in main space  and starts the download dialog.
 
 ## other routing engine modes in app