Normalize exception message
diff --git a/src/main/java/org/apache/commons/compress/archivers/zip/ZipSplitReadOnlySeekableByteChannel.java b/src/main/java/org/apache/commons/compress/archivers/zip/ZipSplitReadOnlySeekableByteChannel.java
index 43ea678..eab8b40 100644
--- a/src/main/java/org/apache/commons/compress/archivers/zip/ZipSplitReadOnlySeekableByteChannel.java
+++ b/src/main/java/org/apache/commons/compress/archivers/zip/ZipSplitReadOnlySeekableByteChannel.java
@@ -128,7 +128,7 @@
      */
     public static SeekableByteChannel forFiles(final File... files) throws IOException {
         final List<Path> paths = new ArrayList<>();
-        for (final File f : Objects.requireNonNull(files, "files must not be null")) {
+        for (final File f : Objects.requireNonNull(files, "files")) {
             paths.add(f.toPath());
         }