diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/c/IGCCASTSimpleDeclSpecifier.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/c/IGCCASTSimpleDeclSpecifier.java
index 2d437431a5d..a5272aaa6bc 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/c/IGCCASTSimpleDeclSpecifier.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/c/IGCCASTSimpleDeclSpecifier.java
@@ -18,6 +18,8 @@ import org.eclipse.cdt.core.dom.ast.c.ICASTSimpleDeclSpecifier;
 /**
  * @deprecated Everything can be expressed as {@link ICASTSimpleDeclSpecifier}.
  * @noreference This interface is not intended to be referenced by clients.
+ * @noextend This interface is not intended to be extended by clients.
+ * @noimplement This interface is not intended to be implemented by clients.
  */
 @Deprecated
 public interface IGCCASTSimpleDeclSpecifier extends ICASTSimpleDeclSpecifier {
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/cpp/IGPPASTDeclSpecifier.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/cpp/IGPPASTDeclSpecifier.java
index 0d0495faaea..c274907dea3 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/cpp/IGPPASTDeclSpecifier.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/core/dom/ast/gnu/cpp/IGPPASTDeclSpecifier.java
@@ -15,6 +15,8 @@ import org.eclipse.cdt.core.dom.ast.IASTDeclSpecifier;
 /**
  * @deprecated Replaced by {@link IASTDeclSpecifier}.
  * @noreference This interface is not intended to be referenced by clients.
+ * @noextend This interface is not intended to be extended by clients.
+ * @noimplement This interface is not intended to be implemented by clients.
  */
 @Deprecated
 public interface IGPPASTDeclSpecifier extends IASTDeclSpecifier {