diff --git a/documentation/geek-faq.md b/documentation/geek-faq.md
index b8b807c9e0..ddd1aefc6f 100644
--- a/documentation/geek-faq.md
+++ b/documentation/geek-faq.md
@@ -58,7 +58,7 @@ Run the script
 - **FORCE_USE_RAMDISK** (yes|no): overrides autodetect for using tmpfs in new debootstrap and image creation process. Takes effect only if `EXPERIMENTAL_DEBOOTSTRAP` is set to "yes"
 - **FIXED_IMAGE_SIZE** (integer): create image file of this size (in megabytes) instead of minimal. Takes effect only if `EXPERIMENTAL_DEBOOTSTRAP` is set to "yes"
 - **COMPRESS_OUTPUTIMAGE** (**yes**|no): create zip archive with image file and GPG signature for redistribution.
-- **USE_F2FS_ROOT** (yes|**no**): create ZIP archive of RAW image. Takes effect only if `EXPERIMENTAL_DEBOOTSTRAP` is set to "yes"
+- **USE_F2FS_ROOT** (yes|**no**): create image with [F2FS](https://en.wikipedia.org/wiki/F2FS) root filesystem instead of default ext4. Requires mainline kernel for Allwinner devices. Requires setting FIXED_IMAGE_SIZE to actual size of your SD card. Takes effect only if `EXPERIMENTAL_DEBOOTSTRAP` is set to "yes"
 
 ### Supplying options via command line parameters
 Instead of editing compile.sh to set options, you can set them by supplying command line parameters to compile.sh
diff --git a/documentation/logbook.md b/documentation/logbook.md
index ff2682909f..1879dcd479 100644
--- a/documentation/logbook.md
+++ b/documentation/logbook.md
@@ -14,6 +14,7 @@
 - readded USB sound
 - added [A13 Olimex SOM](https://www.olimex.com/Products/SOM/A13/A13-SOM-512/)
 - added [LIRC GPIO receive and send driver](https://github.com/igorpecovnik/lib/issues/135) for legacy Allwinner
+- build script: option to build images with F2FS root filesystem for Allwinner boards
 
 **v4.81 / 28.12.2015**