Merge remote-tracking branch 'upstream/master'

# Conflicts:
#	docs/faq_keymap.md

5 files changed, 19 insertions, 2 deletions

diff --git a/docs/_summary.md b/docs/_summary.md
index 723377de98..0f65de0dde 100644
--- a/docs/_summary.md
+++ b/docs/_summary.md
@@ -17,6 +17,7 @@
   * [Mouse keys](mouse_keys.md)
   * [Unicode](unicode.md)
   * [Stenography](stenography.md)
+  * [Key Lock](key_lock.md)
 
 * Reference
   * [Glossary](glossary.md)
diff --git a/docs/build_environment_setup.md b/docs/build_environment_setup.md
index 2282e9d131..d2d63defbd 100644
--- a/docs/build_environment_setup.md
+++ b/docs/build_environment_setup.md
@@ -50,10 +50,10 @@ If you have trouble and want to ask for help, it is useful to generate a *Win_Ch
 If you're using [homebrew,](http://brew.sh/) you can use the following commands:
 
     brew tap osx-cross/avr
-    brew install avr-libc
+    brew install avr-gcc
     brew install dfu-programmer
 
-This is the recommended method. If you don't have homebrew, [install it!](http://brew.sh/) It's very much worth it for anyone who works in the command line. Note that the `make` and `make install` portion during the homebrew installation of avr-libc can take over 20 minutes and exhibit high CPU usage.
+This is the recommended method. If you don't have homebrew, [install it!](http://brew.sh/) It's very much worth it for anyone who works in the command line. Note that the `make` and `make install` portion during the homebrew installation of avr-gcc can take over 20 minutes and exhibit high CPU usage.
 
 You can also try these instructions:
 
diff --git a/docs/key_lock.md b/docs/key_lock.md
new file mode 100644
index 0000000000..e424061a9a
--- /dev/null
+++ b/docs/key_lock.md
@@ -0,0 +1,11 @@
+## Key Lock: Holding down keys for you
+
+Sometimes, you need to hold down a specific key for a long period of time. Whether this is while typing in ALL CAPS, or playing a video game that hasn't implemented auto-run, Key Lock is here to help. Key Lock adds a new keycode, `KC_LOCK`, that will hold down the next key you hit for you. The key is released when you hit it again. Here's an example: let's say you need to type in all caps for a few sentences. You hit KC_LOCK, and then shift. Now, shift will be considered held until you hit it again. You can think of key lock as caps lock, but supercharged.
+
+Here's how to use it:
+
+1. Pick a key on your keyboard. This will be the key lock key. Assign it the keycode `KC_LOCK`. This will be a single-action key: you won't be able to use it for anything else.
+2. Enable key lock by including `KEY_LOCK_ENABLE = yes` in your Makefile.
+3. That's it!
+
+Important: switching layers does not cancel the key lock. Additionally, key lock is only able to hold standard action keys and One Shot modifier keys (for example, if you have your shift defined as `OSM(KC_LSFT)`; see [One Shot Keys](quantum_keycodes.md#one-shot-keys)). This does not include any of the QMK special functions (except One Shot modifiers), or shifted versions of keys such as KC_LPRN. If it's in the [basic_keycodes](basic_keycodes.md) list, it can be held. If it's not, then it can't be.
diff --git a/docs/make_instructions.md b/docs/make_instructions.md
index 64c1cb0f00..299c5785b2 100644
--- a/docs/make_instructions.md
+++ b/docs/make_instructions.md
@@ -158,6 +158,10 @@ This enables using the Quantum SYSEX API to send strings (somewhere?)
 
 This consumes about 5390 bytes.
 
+`KEY_LOCK_ENABLE`
+
+This enables [key lock](key_lock.md). This consumes an additional 260 bytes.
+
 ## Customizing Makefile options on a per-keymap basis
 
 If your keymap directory has a file called `Makefile` (note the filename), any Makefile options you set in that file will take precedence over other Makefile options for your particular keyboard.
diff --git a/docs/quantum_keycodes.md b/docs/quantum_keycodes.md
index 36dbda7a9c..f13801ef59 100644
--- a/docs/quantum_keycodes.md
+++ b/docs/quantum_keycodes.md
@@ -17,6 +17,7 @@ On this page we have documented keycodes between `0x00FF` and `0xFFFF` which are
 |`FUNC(n)`/`F(n)`|Call `fn_action(n)`|
 |`M(n)`|to call macro n|
 |`MACROTAP(n)`|to macro-tap n idk FIXME|
+|`KC_LOCK`|The [lock key](key_lock.md)|
 
 ## Bootmagic Keycodes