diff --git a/src/main/java/org/apache/commons/lang3/Pair.java b/src/main/java/org/apache/commons/lang3/Pair.java
index fef8e4996..89f240439 100644
--- a/src/main/java/org/apache/commons/lang3/Pair.java
+++ b/src/main/java/org/apache/commons/lang3/Pair.java
@@ -23,7 +23,7 @@
 /**
  * A basic immutable Object pair.
  *
- * <p>#ThreadSafe#
+ * <p>#ThreadSafe# if the objects are threadsafe</p>
  * @since Lang 3.0
  * @author Matt Benson
  */
diff --git a/src/main/java/org/apache/commons/lang3/SerializationException.java b/src/main/java/org/apache/commons/lang3/SerializationException.java
index a30870ae7..9586a483d 100644
--- a/src/main/java/org/apache/commons/lang3/SerializationException.java
+++ b/src/main/java/org/apache/commons/lang3/SerializationException.java
@@ -21,7 +21,7 @@
  *
  * <p>The original error is wrapped within this one.</p>
  *
- * <p>#ThreadSafe#
+ * <p>#NotThreadSafe# because Throwable is not threadsafe</p>
  * @author Apache Software Foundation
  * @since 1.0
  * @version $Id$