diff --git a/README.rst b/README.rst
index e27d5901..a272fce8 100644
--- a/README.rst
+++ b/README.rst
@@ -42,9 +42,9 @@ PlatformIO
 .. image:: https://raw.githubusercontent.com/platformio/platformio/develop/docs/_static/platformio-logo.png
     :target: http://platformio.org
 
-`PlatformIO <http://platformio.org>`_ is a cross-platform code builder
-and the missing library manager (Ready for embedded development, IDE and
-Continuous integration, Arduino and MBED compatible).
+`PlatformIO <http://platformio.org>`_ is an open-source cross-platform code
+builder and the missing library manager (Ready for embedded development, IDE
+and Continuous integration, Arduino and MBED compatible).
 
 *Atmel AVR & SAM, Espressif, Freescale Kinetis, Nordic nRF51, NXP LPC,
 Silicon Labs EFM32, ST STM32, TI MSP430 & Tiva, Teensy, Arduino, mbed,
diff --git a/docs/faq.rst b/docs/faq.rst
index 5f9d020c..e865877c 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -13,8 +13,8 @@ General
 What is PlatformIO?
 ~~~~~~~~~~~~~~~~~~~
 
-`PlatformIO <http://platformio.org>`_ is a cross-platform code builder
-and the missing library manager.
+`PlatformIO <http://platformio.org>`_ is an open-source cross-platform code
+builder and the missing library manager.
 
 PlatformIO is independent from the platform, in which it is running. In fact,
 the only requirement is Python, which exists pretty much everywhere. What this
diff --git a/docs/index.rst b/docs/index.rst
index 33e9d7ce..77ea8c75 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,5 +1,5 @@
-PlatformIO is a cross-platform code builder and the missing library manager
-===========================================================================
+PlatformIO is an open-source cross-platform code builder and the missing library manager
+========================================================================================
 
 **Ready for embedded development, IDE and Continuous integration, Arduino and
 MBED compatible**
diff --git a/platformio/__init__.py b/platformio/__init__.py
index 61af9363..9ccfe250 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -6,8 +6,8 @@ __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"
 __description__ = (
-    "Cross-platform code builder and the missing library manager "
-    "(Ready for embedded development, IDE and Continuous integration, "
+    "An open-source cross-platform code builder and the missing library "
+    "manager (Ready for embedded development, IDE and Continuous integration, "
     "Arduino and MBED compatible)"
 )
 __url__ = "http://platformio.org"