diff --git a/src/main/java/org/apache/commons/math/linear/NonPositiveDefiniteLinearOperatorException.java b/src/main/java/org/apache/commons/math/linear/NonPositiveDefiniteLinearOperatorException.java
index 73d749296..56c73c20e 100644
--- a/src/main/java/org/apache/commons/math/linear/NonPositiveDefiniteLinearOperatorException.java
+++ b/src/main/java/org/apache/commons/math/linear/NonPositiveDefiniteLinearOperatorException.java
@@ -30,6 +30,7 @@ import org.apache.commons.math.exception.util.LocalizedFormats;
  * linear operator and {@code x} the "offending" vector.
  *
  * @version $Id$
+ * @since 3.0
  */
 public class NonPositiveDefiniteLinearOperatorException
     extends MathIllegalArgumentException {
diff --git a/src/main/java/org/apache/commons/math/linear/NonSelfAdjointLinearOperatorException.java b/src/main/java/org/apache/commons/math/linear/NonSelfAdjointLinearOperatorException.java
index 7018171b6..5b88e4dd3 100644
--- a/src/main/java/org/apache/commons/math/linear/NonSelfAdjointLinearOperatorException.java
+++ b/src/main/java/org/apache/commons/math/linear/NonSelfAdjointLinearOperatorException.java
@@ -33,6 +33,7 @@ import org.apache.commons.math.exception.util.LocalizedFormats;
  * "offending" vectors, respectively.
  *
  * @version $Id$
+ * @since 3.0
  */
 public class NonSelfAdjointLinearOperatorException
     extends MathIllegalArgumentException {
diff --git a/src/main/java/org/apache/commons/math/linear/RealLinearOperator.java b/src/main/java/org/apache/commons/math/linear/RealLinearOperator.java
index 23ab5acd6..d71e25dc8 100644
--- a/src/main/java/org/apache/commons/math/linear/RealLinearOperator.java
+++ b/src/main/java/org/apache/commons/math/linear/RealLinearOperator.java
@@ -47,6 +47,7 @@ package org.apache.commons.math.linear;
  * </dl>
  *
  * @version $Id$
+ * @since 3.0
  */
 public abstract class RealLinearOperator {
     /**