diff --git a/hutool-core/src/main/java/cn/hutool/core/util/CharUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/CharUtil.java
index 945a85136..1b73f0049 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/CharUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/CharUtil.java
@@ -264,6 +264,7 @@ public class CharUtil implements CharPool {
 				|| c == '\u3164'
 				// Braille Pattern Blank
 				|| c == '\u2800'
+				// MONGOLIAN VOWEL SEPARATOR
 				|| c == '\u180e';
 	}