Merge pull request #1353 from Willmac16/gh-pages

_plugins/gcodeleveling.md

@@ -32,10 +32,31 @@ compatibility:
   python: '>=2.7,<4'
 ---
 
-# Gcode Leveling
+# OctoPrint-GcodeLeveling
 
 This plugin creates a model of the work surface (using the least squares method on user provided points), allowing for leveling of machines through gcode that otherwise cannot be leveled (e.g. for a grbl machine). A user just needs to measure some z values at a variety of x and y values (e.g. with the paper test), then configure a couple of settings, and the plugin will handle the leveling on file upload.
 
+This plugin really only makes sense it you have no other way of leveling out stuff (i.e. your firmware doesn't offer that feature or you are working on a warped material).
+
+## Gcode Support
+
+* This plugin should be fine with most gcode since it only changes movement commands; however, for movement commands and commands that change how movement commands function (e.g. changes in relative/absolute movement) support needs to be added to the plugin.
+
+### Supported Commands
++ `G0`
++ `G1`
++ `G2`/`G3`
+    - See the note on `G17-19`
++ `M82`/`M83`
+
+### Monitored Commands
++  `G90` `G91`
+    - the plugin will not change any values in relative positioning mode
++ `G17` `G18` `G19`
+    - the plugin only modifies arcs in XY workspace mode
++ `G92`
+    - extruder position resets will be respected, any other position resets will stop the plugin from changing any future values on a file
+
 ## Setup
 
 Install via the bundled [Plugin Manager](https://docs.octoprint.org/en/master/bundledplugins/pluginmanager.html)
@@ -44,7 +65,10 @@ or manually using this URL:
     https://github.com/willmac16/OctoPrint-GcodeLeveling/archive/master.zip
 
 + The plugin depends on numpy, so it will need to install this (if it is not already installed), which can take some time on a raspberry pi.
-    - Numpy in a python3 environment requires libatlas3-base, so some instances may need to run ```sudo apt install libatlas3-base``` to install properly.
+    - Numpy in a python3 environment requires libatlas3-base, so some instances may need to run the following to install properly
+```bash
+sudo apt install libatlas3-base libopenblas-dev
+```
 
 ## Configuration