diff --git a/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDynamicTable.java b/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDynamicTable.java
index 6fda10d47e..f45d26cb32 100644
--- a/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDynamicTable.java
+++ b/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackDynamicTable.java
@@ -83,7 +83,7 @@ final class HpackDynamicTable {
      */
     public HpackHeaderField getEntry(int index) {
         if (index <= 0 || index > length()) {
-            throw new IndexOutOfBoundsException();
+            throw new IndexOutOfBoundsException("Index " + index + " out of bounds for length " + length());
         }
         int i = head - index;
         if (i < 0) {