diff --git a/doc/tutorials/introduction/android_binary_package/android_dev_intro.rst b/doc/tutorials/introduction/android_binary_package/android_dev_intro.rst
index 91948afbc..0373ec278 100644
--- a/doc/tutorials/introduction/android_binary_package/android_dev_intro.rst
+++ b/doc/tutorials/introduction/android_binary_package/android_dev_intro.rst
@@ -11,6 +11,18 @@ This guide was written with Windows 7 in mind, though it works with Linux (Ubunt
If you encounter any error after thoroughly following these steps, feel free to contact us via `OpenCV4Android `_ discussion group or OpenCV `Q&A forum `_. We'll do our best to help you out.
+Preface
+=======
+Android is a linux-based, open source mobile operating system developed by Open Handset Allience and backed by Google. See the `official site `_ for general details.
+
+Though being relatively easy to enter, Android development would require fair understanding of programming and its common concepts. Even basic familiarity with Java or C++ is advantageous.
+
+For the quick start with Android development, you should get yourself accustomed with some fundamental Android aspects:
+
+#. Activity and its lifecycle. Information on this essential Android class is available on the `official site for Android developers `_ (see first two sections) or on the corresponding page of the `reference `_.
+#. OpenCV development will certainly require some knowlege of the `Android camera `_ essentials.
+#. Some basic understanding of `Java Native Interface `_ will help you to apprehend the concept of using native code in Java.
+
Quick environment setup for Android development
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