diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt
index 3b57d68c..12a2c01b 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt
@@ -36,8 +36,9 @@ class Variant(val initialProductFlavor: ProductFlavorConfig? = null,
 
     fun resDirectories(project: Project) : List<File> = sourceDirectories(project, "res")
 
-    fun sourceDirectories(project: Project) : List<File> =
-            sourceDirectories(project, project.projectInfo.sourceDirectory)
+    fun sourceDirectories(project: Project) = project.projectInfo.sourceSuffixes.flatMap {
+            sourceDirectories(project, it)
+        }
 
     /**
      * suffix is either "java" (to find source files) or "res" (to find resources)
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/ProjectInfo.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/ProjectInfo.kt
index 300be5a2..81971559 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/ProjectInfo.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/ProjectInfo.kt
@@ -7,12 +7,15 @@ import com.beust.kobalt.api.KobaltContext
 import com.beust.kobalt.api.Project
 import java.util.*
 
+class LanguageInfo(val name: String, val suffix : String = name)
+
 /**
  * Data that is useful for projects to have but should not be specified in the DSL.
  */
 interface IProjectInfo {
-    /** Used to determine the last directory segment of the flavored sources, e.g. src/main/JAVA */
-    val sourceDirectory : String
+    val languageInfos: List<LanguageInfo>
+
+    val sourceSuffixes: List<String>
 
     val defaultSourceDirectories: HashSet<String>
     val defaultTestDirectories: HashSet<String>
@@ -37,9 +40,11 @@ interface IProjectInfo {
     fun dependsOnDirtyProjects(project: Project) = project.projectInfo.dependsOn.any { it.projectInfo.isDirty }
 }
 
-abstract class BaseProjectInfo : IProjectInfo {
+abstract class BaseProjectInfo(override val languageInfos: List<LanguageInfo>) : IProjectInfo {
     abstract fun generate(field: BuildConfigField) : String
 
+    override val sourceSuffixes = languageInfos.map { it.suffix }
+
     fun generate(type: String, name: String, value: Any) = generate(BuildConfigField(type, name, value))
 
     fun generateFieldsFromContributors(project: Project, context: KobaltContext)
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt b/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt
index f3a21975..2b3b1aa1 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt
@@ -37,7 +37,7 @@ class JavaPlugin @Inject constructor(
 
     // IDocContributor
     override fun affinity(project: Project, context: KobaltContext) =
-            if (project.sourceSuffix == ".java") 1 else 0
+            if (project.sourceDirectories.any { it.contains("java") }) 1 else 0
 
     override fun generateDoc(project: Project, context: KobaltContext, info: CompilerActionInfo) : TaskResult {
         val result =
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/java/JavaProjectInfo.kt b/src/main/kotlin/com/beust/kobalt/plugin/java/JavaProjectInfo.kt
index 6084e94d..11f55760 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/java/JavaProjectInfo.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/java/JavaProjectInfo.kt
@@ -6,11 +6,11 @@ import com.beust.kobalt.api.BuildConfigField
 import com.beust.kobalt.api.KobaltContext
 import com.beust.kobalt.api.Project
 import com.beust.kobalt.internal.BaseProjectInfo
+import com.beust.kobalt.internal.LanguageInfo
 import com.google.inject.Singleton
 
 @Singleton
-class JavaProjectInfo : BaseProjectInfo() {
-    override val sourceDirectory = "java"
+class JavaProjectInfo : BaseProjectInfo(listOf(LanguageInfo("java", "java"))) {
     override val defaultSourceDirectories = hashSetOf("src/main/java", "src/main/resources", "src/main/res")
     override val defaultTestDirectories = hashSetOf("src/test/java", "src/test/resources", "src/test/res")
 
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt b/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt
index 2dee776e..6158236c 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt
@@ -125,7 +125,7 @@ class KotlinPlugin @Inject constructor(
     // ICompilerContributor
 
     override fun affinity(project: Project, context: KobaltContext) =
-            if (project.sourceSuffix == ".kt") 1 else 0
+            if (project.sourceDirectories.any { it.contains("kotlin") }) 2 else 0
 
     override fun compile(project: Project, context: KobaltContext, info: CompilerActionInfo) : TaskResult {
         val result =
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinProjectInfo.kt b/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinProjectInfo.kt
index ebdf70e1..9d951583 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinProjectInfo.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinProjectInfo.kt
@@ -6,11 +6,11 @@ import com.beust.kobalt.api.BuildConfigField
 import com.beust.kobalt.api.KobaltContext
 import com.beust.kobalt.api.Project
 import com.beust.kobalt.internal.BaseProjectInfo
+import com.beust.kobalt.internal.LanguageInfo
 import com.google.inject.Singleton
 
 @Singleton
-class KotlinProjectInfo : BaseProjectInfo() {
-    override val sourceDirectory = "kotlin"
+class KotlinProjectInfo : BaseProjectInfo(listOf(LanguageInfo("kotlin", "kt"))) {
     override val defaultSourceDirectories = hashSetOf("src/main/kotlin", "src/main/resources", "src/main/res")
     override val defaultTestDirectories = hashSetOf("src/test/kotlin", "src/test/resources", "src/test/res")