diff --git a/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java b/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java
index 7693b55..133e37a 100644
--- a/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java
+++ b/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java
@@ -21,11 +21,11 @@ import org.lucares.utils.byteencoder.VariableByteEncoder;
  * <pre>
  * Node layout:
  *
- *  ◀───────   Prefix ──────▶          ◀───────────────── Suffix ──────────────────▶
+ *  ────────   Prefix ──────▶          ◀───────────────── Suffix ───────────────────
  * ┏━━━┳━━━━━┳━━━━━┳━━━━━┳━━━┳╸╺╸╺╸╺╸╺┳━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━┓
  * ┃ 6 ┃ 5,6 ┃ 3,6 ┃ 3,2 ┃ ∅ ┃        ┃"ba"->"147"┃"foobar"->"467"┃"foobaz"->"value"┃
  * ┗━━━┻━━━━━┻━━━━━┻━━━━━┻━━━┻╸╺╸╺╸╺╸╺┻━━━━━━━━━━━┻━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━━━┛
- *   │   │ │   │ │   │ │   └▶  null byte that serves as a separator for the prefix.
+ *   │   │ │   │ │   │ │   └▶  null byte that serves as a terminator for the prefix.
  *   │   │ │   │ │   │ └▶ size of the third last key ("ba" in this example)
  *   │   │ │   │ │   └▶ size of the third last value ("147" in this example)
  *   │   │ │   │ └▶ size of the second last key ("foobar" in this example)
@@ -202,13 +202,13 @@ public class PersistentMapDiskNode {
                 + String.join("\n", entries.values().stream().map(NodeEntry::toString).collect(Collectors.toList()));
     }
 
-    public <K, V> String toString(Function<byte[], K> keyDecoder, Function<byte[], V> valueDecoder) {
-        StringBuilder result = new StringBuilder();
+    public <K, V> String toString(final Function<byte[], K> keyDecoder, final Function<byte[], V> valueDecoder) {
+        final StringBuilder result = new StringBuilder();
         result.append("@");
         result.append(nodeOffset);
         result.append(": ");
-        for (NodeEntry e : entries.values()) {
-            String s = e.toString(keyDecoder, valueDecoder);
+        for (final NodeEntry e : entries.values()) {
+            final String s = e.toString(keyDecoder, valueDecoder);
             result.append("\n");
             result.append(s);
         }