diff --git a/doc/README.md b/doc/README.md
index 2d1cd270..0935b94b 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -25,4 +25,7 @@ After LaTeX is installed, call
 ```
 # chmod +x build-doc.sh 
 # ./build-doc.sh <version_code>
-```
\ No newline at end of file
+```
+
+Android Emulator used to export documentation:
+Nexus 4, 768 x 1280, 320 dpi
\ No newline at end of file
diff --git a/images/screenshots/README.md b/images/screenshots/README.md
new file mode 100644
index 00000000..420eb763
--- /dev/null
+++ b/images/screenshots/README.md
@@ -0,0 +1,4 @@
+# Android screenshots
+- android-phone: Nexus 5X, 1080 x 1920, 420 dpi
+- android-7-inch: Nexus 7 2013, 1200 x 1920, 320 dpi
+- android-10-inch: Nexus 10, 1600 x 2560, 320 dpi