diff --git a/build.gradle b/build.gradle
index 92454fa..dd9fb99 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,6 +16,14 @@ dependencies {
     compile localGroovy()
 }
 
+javadoc {
+    source 'buildSrc/src/main/java'
+}
+
+groovydoc {
+    source 'buildSrc/src/main/groovy'
+}
+
 jar {
     from "${rootProject.rootDir}/buildSrc/build/classes/groovy/main"
     from("${rootProject.rootDir}/buildSrc/src/main/groovy") {
diff --git a/buildSrc/src/main/java/com/widen/plugins/buildkite/JavadocStub.java b/buildSrc/src/main/java/com/widen/plugins/buildkite/JavadocStub.java
new file mode 100644
index 0000000..aab66ab
--- /dev/null
+++ b/buildSrc/src/main/java/com/widen/plugins/buildkite/JavadocStub.java
@@ -0,0 +1,8 @@
+package com.widen.plugins.buildkite;
+
+/**
+ * This class only serves as a placeholder to generate non-empty javadoc, which appears to be required for
+ * plugin publishing (and having multiple sources with the same hash causes an error within the plugin-publish plugin).
+ */
+public class JavadocStub {
+}