1 files changed, 1 insertions, 1 deletions
diff --git a/src/java/org/apache/fop/render/intermediate/IFSerializer.java b/src/java/org/apache/fop/render/intermediate/IFSerializer.java
index 03f96c288..50bc5f7de 100644
--- a/src/java/org/apache/fop/render/intermediate/IFSerializer.java
+++ b/src/java/org/apache/fop/render/intermediate/IFSerializer.java
@@ -595,7 +595,7 @@ public class IFSerializer extends AbstractXMLWritingIFDocumentHandler
             }
         } else {
             throw new UnsupportedOperationException(
-                    "Don't know how to handle extension object: "
+                    "Extension must implement XMLizable: "
                     + extension + " (" + extension.getClass().getName() + ")");
         }
     }