diff --git a/build.gradle b/build.gradle
index 0b1bc0b..10a6334 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,27 +8,33 @@ buildscript {
     }
 }
 
+// setup plugins to use
 plugins {
     id 'de.fuerstenau.buildconfig' version '1.1.8'
     id 'idea'
     id 'net.minecraftforge.gradle.forge' version '2.0.2'
 }
 
+// setup external properties file
 ext.configFile = file "build.properties"
 
+// read external properties file
 configFile.withReader {
     def prop = new Properties()
     prop.load(it)
     project.ext.config = new ConfigSlurper().parse prop
 }
 
+// set default version, group and package namespace
 version = config.mc_version + '-' + config.mod_version
 group = config.mod_group
 archivesBaseName = config.mod_name
 
+// if we are building from pipeline, then add build number to the version
 if (System.getenv().BUILD_NUMBER)
 	version = "${version}.${System.getenv().BUILD_NUMBER}"
 
+// if we are not building with a key, add this to the version
 if (!project.hasProperty('signingKeystore')) {
     project.properties.put('signingFingerprint', 'unsigned')
     version = version + '-unsigned'
@@ -44,13 +50,8 @@ minecraft {
 	version = "${config.mc_version}-${config.forge_version}"
     runDir = "run"
 
-    // the mappings can be changed at any time, and must be in the following format.
-    // snapshot_YYYYMMDD   snapshot are built nightly.
-    // stable_#            stables are built at the discretion of the MCP team.
-    // Use non-default mappings at your own risk. they may not always work.
-    // simply re-run your setup task after changing the mappings to update your workspace.
-    mappings = "snapshot_20170624"
-    // makeObfSourceJar = false // an Srg named sources jar is made by default. uncomment this to disable.
+    mappings = 'stable_39'
+    makeObfSourceJar = false
 }
 
 dependencies {