diff --git a/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessor.java b/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessor.java
index 18a78355fc..4f9d32712f 100644
--- a/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessor.java
+++ b/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessor.java
@@ -41,4 +41,15 @@ import sonia.scm.plugin.ExtensionPoint;
  * @since 1.17
  */
 @ExtensionPoint
-public interface BlameLinePreProcessor extends PreProcessor<BlameLine> {}
+public interface BlameLinePreProcessor extends PreProcessor<BlameLine>
+{
+
+  /**
+   * Method description
+   *
+   *
+   * @param blameLine
+   */
+  @Override
+  public void process(BlameLine blameLine);
+}
diff --git a/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessorFactory.java b/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessorFactory.java
index 7d529e487c..fc49dd43ec 100644
--- a/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessorFactory.java
+++ b/scm-core/src/main/java/sonia/scm/repository/BlameLinePreProcessorFactory.java
@@ -42,4 +42,17 @@ import sonia.scm.plugin.ExtensionPoint;
  */
 @ExtensionPoint
 public interface BlameLinePreProcessorFactory
-        extends PreProcessorFactory<BlameLine> {}
+        extends PreProcessorFactory<BlameLine>
+{
+
+  /**
+   * Method description
+   *
+   *
+   * @param repository
+   *
+   * @return
+   */
+  @Override
+  public BlameLinePreProcessor createPreProcessor(Repository repository);
+}