diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..ba30ee1
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,19 @@
+## General guide
+
+[Collaboration guide](https://github.com/simon987/Much-Assembly-Required/wiki/Collaboration-Guide)
+
+## Before creating a pull request
+
+Here small unordered list of guidelines to read before creating a pull request
+- Use java <= 1.8 features
+- Please follow [Google's Java style guide](https://google.github.io/styleguide/javaguide.html)
+- Constants (e.g. the energy cost of an in-game action) should be loaded from config.properties
+- The project is separated into multiple modules, the `Server` module and its plugins. Plugins should 
+not depend on another plugin to compile or to run.
+(e.g. NPC plugin shouldn't import `net.simon987.biomassplugin` )
+- Use `Logmanager.LOGGER` to log messages to the console. Use `.fine()` for debugging messages and `.info()` for 
+info for more important messages 
+that are not too frequently used.
+- Do not submit a pull request for a new feature that has not been approved 
+by [simon987](https://github.com/simon987) in an Issue beforehand
+- Please state what tests have been performed in the pull request
diff --git a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotDrill.java b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotDrill.java
index e8e749f..975deab 100644
--- a/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotDrill.java	
+++ b/Plugin Cubot/src/main/java/net/simon987/cubotplugin/CubotDrill.java	
@@ -18,8 +18,7 @@ public class CubotDrill extends CpuHardware {
     public static final int DEFAULT_ADDRESS = 5;
 
     private static final int DRILL_POLL = 1;
-    private static final int DRILL_GATHER_SLOW = 2;
-    private static final int DRILL_GATHER_FAST = 3;
+    private static final int DRILL_GATHER = 2; // simplified gather
 
     private Cubot cubot;
 
@@ -40,7 +39,7 @@ public class CubotDrill extends CpuHardware {
 
             getCpu().getRegisterSet().getRegister("B").setValue(0);
 
-        } else if (a == DRILL_GATHER_SLOW || a == DRILL_GATHER_FAST) {
+        } else if (a == DRILL_GATHER) {
 
             if (cubot.spendEnergy(1400)) {
                 if (cubot.getCurrentAction() == Action.IDLE) {