1 files changed, 17 insertions, 1 deletions
diff --git a/java/src/main/java/org/pablotron/luigi/errors/UnknownEntryError.java b/java/src/main/java/org/pablotron/luigi/errors/UnknownEntryError.java
index 7710838..7ce1f9b 100644
--- a/java/src/main/java/org/pablotron/luigi/errors/UnknownEntryError.java
+++ b/java/src/main/java/org/pablotron/luigi/errors/UnknownEntryError.java
@@ -1,9 +1,25 @@
 package org.pablotron.luigi.errors;
 
-public class UnknownEntryError extends LuigiError {
+/**
+ * Base class for all unknown entry errors raised by this library.
+ */
+public abstract class UnknownEntryError extends LuigiError {
+  /**
+   * Entry type (e.g. "template", "key", or "filter").
+   */
   public final String type;
+
+  /**
+   * Entry name.
+   */
   public final String name;
 
+  /**
+   * This is an abstract class and cannot be instantiated directly.
+   *
+   * @param type Entry type ("template", "key", or "filter").
+   * @param name Entry name.
+   */
   public UnknownEntryError(final String type, final String name) {
     super(String.format("unknown %s: %s", type, name));