diff --git a/docs/projectconf.rst b/docs/projectconf.rst
index d87fa377..66c8cd0c 100644
--- a/docs/projectconf.rst
+++ b/docs/projectconf.rst
@@ -432,11 +432,25 @@ See built-in examples of `PlatformIO build scripts <https://github.com/platformi
 A list with targets which will be processed by :ref:`cmd_run` command by
 default. You can enter more then one target separated with "space".
 
-When no targets are defined, *PlatformIO* will build only sources by default.
+Pre-built targets:
 
-.. note::
-    This option is useful to enable "auto-uploading" after building operation
-    (``targets = upload``).
+* ``clean`` delete compiled object files, libraries and firmware binaries
+* ``upload`` enable "auto-uploading" for embedded platforms after building
+  operation
+* ``envdump`` dump current build environment
+
+**Tip!** You can use these targets like an option to
+:option:`platformio run --target` command. For example:
+
+.. code-block:: bash
+
+    # clean project
+    platformio run -t clean
+
+    # dump curent build environment
+    platformio run --target envdump
+
+When no targets are defined, *PlatformIO* will build only sources by default.
 
 .. _projectconf_examples:
 
diff --git a/platformio/__init__.py b/platformio/__init__.py
index 44e5dbb5..2035491a 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -1,7 +1,7 @@
 # Copyright (C) Ivan Kravets <me@ikravets.com>
 # See LICENSE for details.
 
-VERSION = (2, 2, "0.dev5")
+VERSION = (2, 2, "0.dev6")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"