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diff --git a/src/main/java/de/waldheinz/fs/ReadOnlyException.java b/src/main/java/de/waldheinz/fs/ReadOnlyException.java
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+++ b/src/main/java/de/waldheinz/fs/ReadOnlyException.java
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+/*
+ * Copyright (C) 2009,2010 Matthias Treydte <mt@waldheinz.de>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; If not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+package de.waldheinz.fs;
+
+/**
+ * This exception is thrown when an attempt is made to write to a read-only
+ * {@link BlockDevice}, {@link FileSystem} or other file system object. This is
+ * an unchecked exception, as it should always be possible to query the object
+ * about it's read-only state using it's {@code isReadOnly()} method.
+ * 
+ * @author Matthias Treydte &lt;waldheinz at gmail.com&gt;
+ * @see FileSystem#isReadOnly()
+ * @see BlockDevice#isReadOnly() 
+ */
+public final class ReadOnlyException extends RuntimeException {
+
+    private final static long serialVersionUID = 1;
+    
+    /**
+     * Creates a new instance of {@code ReadOnlyException}.
+     *
+     */
+    public ReadOnlyException() {
+        super("read-only");
+    }
+}