diff --git a/src/ooxml/java/org/apache/poi/openxml4j/opc/ZipPackage.java b/src/ooxml/java/org/apache/poi/openxml4j/opc/ZipPackage.java
index f0db2ab283..4f463e0df8 100755
--- a/src/ooxml/java/org/apache/poi/openxml4j/opc/ZipPackage.java
+++ b/src/ooxml/java/org/apache/poi/openxml4j/opc/ZipPackage.java
@@ -250,7 +250,8 @@ public final class ZipPackage extends Package {
 			return new MemoryPackagePart(this, partName, contentType,
 					loadRelationships);
 		} catch (InvalidFormatException e) {
-			System.err.println(e);
+			// TODO - don't use system.err.  Is it valid to return null when this exception occurs?
+			System.err.println(e); 
 			return null;
 		}
 	}