diff --git a/doc/developers-guide.md b/doc/developers-guide.md
index a5a57cb7..1c45fb83 100644
--- a/doc/developers-guide.md
+++ b/doc/developers-guide.md
@@ -1,12 +1,29 @@
 Developer's Guide
 =================
 
+Cloning
+-------
+
+Please see the [Contributing](#contributing) section, below, for details
+on how to fork and clone when contributing to Infix.
+
+```bash
+$ mkdir ~/Projects; cd ~/Projects
+$ git clone https://github.com/kernelkit/infix.git
+$ cd infix/
+$ git submodule update --init
+```
+
+
 Building
 --------
 
 Buildroot is almost stand-alone, it needs a few locally installed tools
 to bootstrap itself.  For details, see the [excellent manual][manual].
 
+> **Note:** installation for Debian/Ubuntu based systems: <kbd>sudo apt
+> install make libssl-dev</kbd>
+
 Briefly, to build an Infix image; select the target and then make:
 
     make x86_64_defconfig
@@ -20,10 +37,42 @@ To see available defconfigs for supported targets, use:
 
     make list-defconfigs
 
-> **Note:** build dependencies (Debian/Ubuntu): <kbd>sudo apt install make libssl-dev</kbd>
+
+Testing
+-------
+
+Manual testing can be done using Qemu by calling <kbd>make run</kbd>,
+see also [Infix in Virtual Environments](virtual.md).
+
+The Infix automated test suite is built around Qemu and [Qeneth][2], see:
+
+ * [Testing](doc/testing.md)
+ * [Docker Image](test/docker/README.md)
 
 
-[manual]: https://buildroot.org/downloads/manual/manual.html
+Contributing
+------------
 
+Infix is built from many parts, when contributing you need to set up
+your own fork, create a local branch for your change, push to your fork,
+and then use GitHub to create a *Pull Reqeuest*.
 
-[7]: https://github.com/wkz/qeneth
+For this to work as painlessly as possible:
+
+  1. Fork Infix to your own user
+  2. Fork all the Infix submodules, e.g., `buildroot` to your own user
+  3. Clone your fork of Infix to your laptop/workstation
+
+```bash
+$ cd ~/Projects
+$ git clone https://github.com/YOUR_USER_NAME/infix.git
+$ cd infix/
+$ git submodule update --init
+```
+
+> **Note:** when updating/synchronizing with upstream Infix changes you
+> may have to synchronize your forks as well.  GitHub have a `Sync fork`
+> button in the GUI for your fork for this purpose.
+
+[1]: https://buildroot.org/downloads/manual/manual.html
+[2]: https://github.com/wkz/qeneth