diff --git a/src/main/kotlin/com/google/androidstudiopoet/AndroidStudioPoet.kt b/src/main/kotlin/com/google/androidstudiopoet/AndroidStudioPoet.kt
index 05704648..d22e765b 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/AndroidStudioPoet.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/AndroidStudioPoet.kt
@@ -44,7 +44,7 @@ class AndroidStudioPoet(private val modulesWriter: SourceModuleWriter, private v
                     Injector.configPojoToBuildTypeConfigsConverter).run()
         }
 
-        @Language("JSON") const val SAMPLE_CONFIG = """
+        @Language("JSON") val SAMPLE_CONFIG = """
             {
               "projectName": "genny",
               "root": "./modules/",
@@ -73,7 +73,7 @@ class AndroidStudioPoet(private val modulesWriter: SourceModuleWriter, private v
               ],
               "buildTypes": 6
             }
-            """
+            """.trimIndent()
     }
 
     fun run() {
diff --git a/src/main/kotlin/com/google/androidstudiopoet/BuildGradle.kt b/src/main/kotlin/com/google/androidstudiopoet/BuildGradle.kt
index dd5e6525..cb65b239 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/BuildGradle.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/BuildGradle.kt
@@ -14,12 +14,14 @@
 
 package com.google.androidstudiopoet
 
+import com.google.androidstudiopoet.utils.joinLines
+
 annotation class Fancy
 
 @Fancy
 object BuildGradle {
 
-    fun print(dependencies: String, useKotlin: Boolean) = "" +
+    fun print(dependencies: String, useKotlin: Boolean, extraLines: List<String>? = null) = "" +
             "apply plugin: 'java-library'\n" +
             (if (useKotlin)
                 "apply plugin: 'kotlin'\n"
@@ -51,7 +53,7 @@ object BuildGradle {
             "repositories {\n" +
             "    mavenCentral()\n" +
             "}\n" +
-            if (useKotlin)
+            (if (useKotlin)
                 "compileKotlin {\n" +
                 "    kotlinOptions {\n" +
                 "        jvmTarget = \"1.8\"\n" +
@@ -63,5 +65,6 @@ object BuildGradle {
                 "    }\n" +
                 "}\n"
             else
-                ""
+                "" ) +
+            extraLines.joinLines()
 }
diff --git a/src/main/kotlin/com/google/androidstudiopoet/ModuleBlueprintFactory.kt b/src/main/kotlin/com/google/androidstudiopoet/ModuleBlueprintFactory.kt
index fb42874b..f1f59676 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/ModuleBlueprintFactory.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/ModuleBlueprintFactory.kt
@@ -36,7 +36,7 @@ object ModuleBlueprintFactory {
                 }
         val result = ModuleBlueprint(getModuleNameByIndex(moduleConfig.index), projectRoot, moduleConfig.useKotlin, moduleDependencies,
                 moduleConfig.javaPackageCount, moduleConfig.javaClassCount, moduleConfig.javaMethodsPerClass,
-                moduleConfig.kotlinPackageCount, moduleConfig.kotlinClassCount, moduleConfig.kotlinMethodsPerClass)
+                moduleConfig.kotlinPackageCount, moduleConfig.kotlinClassCount, moduleConfig.kotlinMethodsPerClass, moduleConfig.extraLines)
         synchronized(moduleDependencyLock[moduleConfig.index]) {
             if (moduleDependencyCache[moduleConfig.index] == null) {
                 moduleDependencyCache[moduleConfig.index] = ModuleDependency(result.name, result.methodToCallFromOutside)
@@ -69,7 +69,7 @@ object ModuleBlueprintFactory {
          */
         val tempModuleBlueprint = ModuleBlueprint(getModuleNameByIndex(index), projectRoot, useKotlin, listOf(),
                 javaPackageCount, javaClassCount, javaMethodsPerClass, kotlinPackageCount,kotlinClassCount,
-                kotlinMethodsPerClass)
+                kotlinMethodsPerClass, null)
         return ModuleDependency(tempModuleBlueprint.name, tempModuleBlueprint.methodToCallFromOutside)
 
     }
@@ -102,7 +102,8 @@ object ModuleBlueprintFactory {
                 moduleDependencies, androidModuleConfig.productFlavorConfigs, androidModuleConfig.buildTypes,
                 androidModuleConfig.javaPackageCount, androidModuleConfig.javaClassCount,
                 androidModuleConfig.javaMethodsPerClass, androidModuleConfig.kotlinPackageCount,
-                androidModuleConfig.kotlinClassCount, androidModuleConfig.kotlinMethodsPerClass)
+                androidModuleConfig.kotlinClassCount, androidModuleConfig.kotlinMethodsPerClass,
+                androidModuleConfig.extraLines)
     }
 
     private fun getModuleNameByIndex(index: Int) = "module$index"
diff --git a/src/main/kotlin/com/google/androidstudiopoet/generators/BuildGradleGenerator.kt b/src/main/kotlin/com/google/androidstudiopoet/generators/BuildGradleGenerator.kt
index ff66b89a..19f73b3f 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/generators/BuildGradleGenerator.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/generators/BuildGradleGenerator.kt
@@ -24,6 +24,6 @@ class BuildGradleGenerator {
     fun create(moduleBlueprint: ModuleBlueprint): String {
         return BuildGradle.print(moduleBlueprint.dependencies
                 .map { it -> "compile project(':${it.name}')\n" }
-                .fold(), moduleBlueprint.useKotlin)
+                .fold(), moduleBlueprint.useKotlin, moduleBlueprint.extraLines)
     }
 }
diff --git a/src/main/kotlin/com/google/androidstudiopoet/generators/android_modules/AndroidModuleBuildGradleGenerator.kt b/src/main/kotlin/com/google/androidstudiopoet/generators/android_modules/AndroidModuleBuildGradleGenerator.kt
index 86953329..966abe9d 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/generators/android_modules/AndroidModuleBuildGradleGenerator.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/generators/android_modules/AndroidModuleBuildGradleGenerator.kt
@@ -20,6 +20,7 @@ import com.google.androidstudiopoet.models.AndroidModuleBlueprint
 import com.google.androidstudiopoet.models.Flavor
 import com.google.androidstudiopoet.utils.fold
 import com.google.androidstudiopoet.utils.isNullOrEmpty
+import com.google.androidstudiopoet.utils.joinLines
 import com.google.androidstudiopoet.utils.joinPath
 import com.google.androidstudiopoet.writers.FileWriter
 
@@ -87,6 +88,7 @@ dependencies {
 
     ${align(moduleDependencies.trimEnd(),"    ")}
 }
+${blueprint.extraLines.joinLines()}
 """.trim()
 
         fileWriter.writeToFile(gradleText, moduleRoot.joinPath("build.gradle"))
diff --git a/src/main/kotlin/com/google/androidstudiopoet/input/AndroidModuleConfig.kt b/src/main/kotlin/com/google/androidstudiopoet/input/AndroidModuleConfig.kt
index 99da20d3..f6ef971e 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/input/AndroidModuleConfig.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/input/AndroidModuleConfig.kt
@@ -24,4 +24,5 @@ class AndroidModuleConfig(index: Int, config: ConfigPOJO, val productFlavorConfi
     val hasLaunchActivity = index == 0
     val resourcesConfig = ResourcesConfig(activityCount + 2,
             activityCount + 5, activityCount)
+    override val extraLines = config.extraAndroidBuildFileLines
 }
\ No newline at end of file
diff --git a/src/main/kotlin/com/google/androidstudiopoet/input/ModuleConfig.kt b/src/main/kotlin/com/google/androidstudiopoet/input/ModuleConfig.kt
index a64616de..b0f3aa81 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/input/ModuleConfig.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/input/ModuleConfig.kt
@@ -31,5 +31,5 @@ open class ModuleConfig(val index: Int, config: ConfigPOJO) {
 
     val dependencies = config.resolvedDependencies[index]?.map { it.to } ?: listOf()
 
-
+    open val extraLines = config.extraBuildFileLines
 }
\ No newline at end of file
diff --git a/src/main/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprint.kt b/src/main/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprint.kt
index 48a2ce72..81bda006 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprint.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprint.kt
@@ -33,7 +33,8 @@ data class AndroidModuleBlueprint(val index: Int,
                                   private val productFlavorConfigs: List<FlavorConfig>?,
                                   private val buildTypeConfigs: List<BuildTypeConfig>?,
                                   private val javaPackageCount: Int, private val javaClassCount: Int, private val javaMethodsPerClass: Int,
-                                  private val kotlinPackageCount: Int, private val kotlinClassCount: Int, private val kotlinMethodsPerClass: Int
+                                  private val kotlinPackageCount: Int, private val kotlinClassCount: Int, private val kotlinMethodsPerClass: Int,
+                                  val extraLines: List<String>?
 ) : Blueprint {
 
     val name = "androidAppModule" + index
diff --git a/src/main/kotlin/com/google/androidstudiopoet/models/ConfigPOJO.kt b/src/main/kotlin/com/google/androidstudiopoet/models/ConfigPOJO.kt
index 7729a3cd..0eac9cf6 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/models/ConfigPOJO.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/models/ConfigPOJO.kt
@@ -79,6 +79,10 @@ class ConfigPOJO {
 
     val topologies: List<Map<String, String>>? = null
 
+    val extraBuildFileLines : List<String>? = null
+
+    val extraAndroidBuildFileLines : List<String>? = null
+
     override fun toString(): String = toJson()
 
     private fun toJson(): String {
diff --git a/src/main/kotlin/com/google/androidstudiopoet/models/ModuleBlueprint.kt b/src/main/kotlin/com/google/androidstudiopoet/models/ModuleBlueprint.kt
index 040b6ec0..de5ff000 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/models/ModuleBlueprint.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/models/ModuleBlueprint.kt
@@ -23,7 +23,8 @@ data class ModuleBlueprint(val name: String,
                            val useKotlin: Boolean,
                            val dependencies: List<ModuleDependency>,
                            private val javaPackageCount: Int, private val javaClassCount: Int, private val javaMethodsPerClass: Int,
-                           private val kotlinPackageCount: Int, private val kotlinClassCount: Int, private val kotlinMethodsPerClass: Int) {
+                           private val kotlinPackageCount: Int, private val kotlinClassCount: Int, private val kotlinMethodsPerClass: Int,
+                           val extraLines: List<String>?) {
 
     val moduleRoot = root.joinPath(name)
     val packagesBlueprint = PackagesBlueprint(javaPackageCount, javaClassCount, javaMethodsPerClass, kotlinPackageCount,
diff --git a/src/main/kotlin/com/google/androidstudiopoet/utils/collections.kt b/src/main/kotlin/com/google/androidstudiopoet/utils/collections.kt
index 74108c17..1674c29c 100644
--- a/src/main/kotlin/com/google/androidstudiopoet/utils/collections.kt
+++ b/src/main/kotlin/com/google/androidstudiopoet/utils/collections.kt
@@ -14,4 +14,11 @@
 
 package com.google.androidstudiopoet.utils
 
-fun <T> Collection<T>?.isNullOrEmpty() = this == null || this.isEmpty()
\ No newline at end of file
+fun <T> Collection<T>?.isNullOrEmpty() = this == null || this.isEmpty()
+
+fun <T> Collection<T>?.joinLines(separator: CharSequence = "\n") : String {
+    if (this == null) {
+        return ""
+    }
+    return this.joinToString(separator = separator)
+}
diff --git a/src/test/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprintTest.kt b/src/test/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprintTest.kt
index c7e3e75f..30cb0011 100644
--- a/src/test/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprintTest.kt
+++ b/src/test/kotlin/com/google/androidstudiopoet/models/AndroidModuleBlueprintTest.kt
@@ -11,7 +11,7 @@ class AndroidModuleBlueprintTest {
     private val dependency: ModuleDependency = mock()
     private val originalAndroidModuleBlueprint = AndroidModuleBlueprint(1, 1, resourcesConfig,
             "root", true, false, listOf(dependency), null,null,
-            1, 1, 1, 1, 1, 1)
+            1, 1, 1, 1, 1, 1, null)
 
     @Test
     fun `blueprint create proper activity names`() {