diff --git a/src/test/java/org/apache/commons/lang3/time/DateUtilsTest.java b/src/test/java/org/apache/commons/lang3/time/DateUtilsTest.java
index 730959adf..d3e7abbac 100644
--- a/src/test/java/org/apache/commons/lang3/time/DateUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/time/DateUtilsTest.java
@@ -46,7 +46,7 @@ import org.junitpioneer.jupiter.DefaultLocale;
 /**
  * Tests {@link org.apache.commons.lang3.time.DateUtils}.
  * <p>
- * NOT THREAD_SAFE.
+ * NOT THREAD-SAFE.
  * </p>
  */
 public class DateUtilsTest extends AbstractLangTest {
diff --git a/src/test/java/org/apache/commons/lang3/time/DurationFormatUtilsTest.java b/src/test/java/org/apache/commons/lang3/time/DurationFormatUtilsTest.java
index 0a7e17f8a..2266abb4a 100644
--- a/src/test/java/org/apache/commons/lang3/time/DurationFormatUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/time/DurationFormatUtilsTest.java
@@ -37,7 +37,7 @@ import org.junitpioneer.jupiter.DefaultTimeZone;
 /**
  * TestCase for DurationFormatUtils.
  * <p>
- * NOT THREAD_SAFE.
+ * NOT THREAD-SAFE.
  * </p>
  */
 public class DurationFormatUtilsTest extends AbstractLangTest {