diff --git a/documentation/Enabling_hardware_features.md b/documentation/Enabling_hardware_features.md
index 8ea9fcda71..db10cae596 100644
--- a/documentation/Enabling_hardware_features.md
+++ b/documentation/Enabling_hardware_features.md
@@ -5,6 +5,24 @@ Some boards require some manual configuration to turn on/off certain features
 
 In some cases, the procedure is "less than obvious", so we document some basic examples here.
 
+# Generic howto for Allwinner devices
+
+## Legacy or Vanilla kernel ?
+
+Many Armbian images come in two flavours : Legacy (using an older kernel version) and Vanilla (up-to-date kernel). Depending on kernel version, the procedure to enable/disable features is not the same :
+ * Legacy kernel : FEX
+ * Vanilla kernel : DT (Device Tree)
+
+## What flavour am I using ?
+
+Best way to know is by checking your kernel version :
+
+```
+root@bananapipro:~# uname -a
+Linux bananapipro 4.5.2-sunxi #11 SMP Thu Apr 28 21:53:25 CEST 2016 armv7l GNU/Linux
+```
+
+In this example the kernel version is 4.5.2 so you can use DT to tweak some settings. If you get a kernel version 3.X then you'll be certainly using FEX.
 
 # H3 based Orange Pi, legacy kernel