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+# How to contribute
+
+This directory structure contains some repositories that are copied from external sources.
+
+Please follow these instructions to send contributions to master repositories.
+
+## Directory structure
+
+This directory consists of following modules
+
+* [coap-service](#coap-service)
+* [mbed-mesh-api](#mbed-mesh-api)
+* [nanostack-interface](#nanostack-interface)
+* [sal-stack-nanostack](#sal-stack-nanostack)
+
+## coap-service
+
+Master repository is located in the https://github.com/ARMmbed/coap-service
+
+Please send contributions against that repository.
+
+To test changes, remove the `coap-service` repository and replace with Git clone
+of the master repository.
+
+```
+rm -rf coap-service
+git clone git@github.com:ARMmbed/coap-service.git
+```
+
+## mbed-mesh-api
+
+This is the master source of mbed-mesh-api.
+Send contributions directly to this repository.
+
+## nanostack-interface
+
+This is the master source of nanostack-interface.
+Send contributions directly to this repository.
+
+## sal-stack-nanostack
+
+This directory holds source code snapshot of the Nanostack networking library. Master repository is available for **mbed Partners** in https://github.com/ARMmbed/sal-stack-nanostack-private. 
+
+If you have access to the master repository, please send contributions against that repository.
+
+To test changes with access to master repository:
+ * Remove the sal-stack-nanostack directory: `rm -rf sal-stack-nanostack`
+ * Clone the master repository `git clone git@github.com:ARMmbed/sal-stack-nanostack-private.git`as sal-stack-nanostack
+
+Now you can modify, build and test your changes with the mbed OS build.
+
+**NOTE:** You do not need to clone the Nanostack master repository to exactly same location in the build tree. 
+
+If you don't have access to the master repository then you can send contributions directly to this repository.
+
+