diff --git a/src/java.base/share/classes/java/lang/Character.java b/src/java.base/share/classes/java/lang/Character.java
index d866202909c..b71849eaee7 100644
--- a/src/java.base/share/classes/java/lang/Character.java
+++ b/src/java.base/share/classes/java/lang/Character.java
@@ -743,7 +743,8 @@ class Character implements java.io.Serializable, Comparable<Character>, Constabl
      */
     public static final class UnicodeBlock extends Subset {
         /**
-         * NUM_ENTITIES should match the total number of UnicodeBlocks.
+         * NUM_ENTITIES should match the total number of UnicodeBlock identifier
+         * names plus their aliases.
          * It should be adjusted whenever the Unicode Character Database
          * is upgraded.
          */