updated readme

1 files changed, 21 insertions, 11 deletions

diff --git a/keyboard/planck/README.md b/keyboard/planck/README.md
index 206d6ad80d..530fc21212 100644
--- a/keyboard/planck/README.md
+++ b/keyboard/planck/README.md
@@ -1,29 +1,39 @@
 Planck keyboard firmware
 ======================
-DIY/Assembled compact ortholinear keyboard by [Ortholinear Keyboards](http://ortholinearkeyboards.com).
+DIY/Assembled compact ortholinear 40% keyboard by [Ortholinear Keyboards](http://ortholinearkeyboards.com).
 
-## Notable TMK forks (which some of the keymap files are from)
-- [Shane's Fork](https://github.com/shanecelis/tmk_keyboard/tree/master/keyboard/planck)
-- [Pierre's Fork](https://github.com/pcarrier/tmk_keyboard/blob/pcarrier/planck/keyboard/gh60/keymap_planck.c)
-- [Nathan's Fork](https://github.com/nathanrosspowell/tmk_keyboard/tree/planck-jack/keyboard/planck)
-- [Matthew's Fork](https://github.com/pepers/tmk_keyboard/tree/master/keyboard/planck_grid)
+## Extended Keymap
+If you include extended_keymap_common.h instead of keymap_common.h at the top of your file, you'll have access to a bunch of goodies:
+
+- Use `LSFT()`, `LCTL()`, et. al. (listed in extended_keymap_common.h) as modifiers for keys (daisy-chain-able)
+- Use `FUNC(1)` instead of `FN1` (etc.) to access the function layers beyond the 32 function layer limit
+- Use `CM_F` instead of `KC_F` to get the ColeMak equivilent for shortcuts (maps backwards)
+
+### Some notes on usage:
+
+- The `KEYMAP()` macro is unable to be used due to the bitwise modifications that take place - refer to extended_keymap_jack.c to see how to set things up with the `KC_` prefix
+- Keep an eye on the Makefile - this needs to include the correct files to work
+- Don't forget to use `const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {` instead of the 8bit equivilent
 
 ## Build
 
 Follow [this guide](http://deskthority.net/workshop-f7/how-to-build-your-very-own-keyboard-firmware-t7177.html) to setup your development environment before anything else.
 
-Download the whole firmware [here](https://github.com/jackhumbert/tmk_keyboard/archive/master.zip) and navigate to the keyboard/planck folder. Once your dev env is setup, you'll be able to type "make" to generate your .hex that you can load with the Teensy app onto your Planck (once you've hit reset/shorted GND & RST).
+Download the whole firmware [here](https://github.com/jackhumbert/tmk_keyboard/archive/master.zip) and navigate to the keyboard/planck folder. Once your dev env is setup, you'll be able to type `make` to generate your .hex that you can load with the Teensy app onto your Planck (once you've hit reset/shorted GND & RST).
 
 Move to this directory then just run `make` like:
 
     $ make
 
-Use `make -f Makefile.pjrc` if you want to use PJRC stack but I find no reason to do so now.
-
-
 ## Keymap
-Several version of keymap are available in advance but you are recommended to define your favorite layout yourself. To define your own keymap create file named `keymap_<name>.c` and see keymap document(you can find in top README.md) and existent keymap files.
+Several version of keymap are available in advance but you are recommended to define your favorite layout yourself. To define your own keymap create file named `keymap_<name>.c` and see keymap document (you can find in top README.md) and existent keymap files.
 
 To build firmware binary hex file with a certain keymap just do `make` with `KEYMAP` option like:
 
     $ make KEYMAP=[<name>]
+
+## Notable TMK forks (which some of the keymap files are from)
+- [Shane's Fork](https://github.com/shanecelis/tmk_keyboard/tree/master/keyboard/planck)
+- [Pierre's Fork](https://github.com/pcarrier/tmk_keyboard/blob/pcarrier/planck/keyboard/gh60/keymap_planck.c)
+- [Nathan's Fork](https://github.com/nathanrosspowell/tmk_keyboard/tree/planck-jack/keyboard/planck)
+- [Matthew's Fork](https://github.com/pepers/tmk_keyboard/tree/master/keyboard/planck_grid)
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