1 files changed, 10 insertions, 1 deletions
diff --git a/java/src/main/java/org/pablotron/luigi/errors/UnknownFilterError.java b/java/src/main/java/org/pablotron/luigi/errors/UnknownFilterError.java
index 7396da6..ce5ed4b 100644
--- a/java/src/main/java/org/pablotron/luigi/errors/UnknownFilterError.java
+++ b/java/src/main/java/org/pablotron/luigi/errors/UnknownFilterError.java
@@ -1,6 +1,15 @@
 package org.pablotron.luigi.errors;
 
-public class UnknownFilterError extends UnknownEntryError {
+/**
+ * Thrown when an unknown filter is encountered while running a
+ * template.
+ */
+public final class UnknownFilterError extends UnknownEntryError {
+  /**
+   * Create a new UnknownFilterError instance.
+   *
+   * @param name Unknown filter name.
+   */
   public UnknownFilterError(final String name) {
     super("filter", name);
   }