diff --git a/src/xdocs/config_design.xml b/src/xdocs/config_design.xml
index 37e2ce8d7..bf6183495 100644
--- a/src/xdocs/config_design.xml
+++ b/src/xdocs/config_design.xml
@@ -72,7 +72,7 @@ method will never affect the behavior of any other method.
         </ul>
 
         <p>
-          Rationale: This API design style protects superclasses against
+          Rationale: This library design style protects superclasses against
           being broken by subclasses. The downside is that subclasses are
           limited in their flexibility, in particular they cannot prevent
           execution of code in the superclass, but that also means that