diff --git a/README.md b/README.md
index 2f4006ab6..a47a430d7 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,9 @@ Linphone is a free VoIP and video softphone based on the SIP protocol.
 
 ## To build liblinphone for Android, you must:
 
-1. Download the Android sdk (API 25.2.3 at max) with platform-tools and tools updated to latest revision, then add both 'tools' and 'platform-tools' folders in your path.
+1. Download the Android sdk (API 25.2.3 at max) with platform-tools and tools updated to latest revision, then add both 'tools' and 'platform-tools' folders in your path and the android-sdk folder to ANDROID_HOME environment variable.
 
-2. Download the Android ndk (version r11c or 13b) from google and add it to your path (no symlink !!!).
+2. Download the Android ndk (version r11c or 13b) from google and add it to your path (no symlink !!!) and ANDROID_NDK environment variable.
 
 3. Install _yasm_, _nasm_, _ant_, _python_, _intltoolize_, _cmake_ and _vim-common_.
   * On 64 bits linux systems you'll need the _ia32-libs_ package.