Javadoc: Use "file system" instead of "filesystem".
diff --git a/src/main/java/org/apache/commons/fileupload2/DefaultFileItem.java b/src/main/java/org/apache/commons/fileupload2/DefaultFileItem.java
index dcbe7ca..e537b03 100644
--- a/src/main/java/org/apache/commons/fileupload2/DefaultFileItem.java
+++ b/src/main/java/org/apache/commons/fileupload2/DefaultFileItem.java
@@ -49,7 +49,7 @@
      *                      <code>null</code> if not specified.
      * @param isFormField   Whether or not this item is a plain form field, as
      *                      opposed to a file upload.
-     * @param fileName      The original filename in the user's filesystem, or
+     * @param fileName      The original filename in the user's file system, or
      *                      <code>null</code> if not specified.
      * @param sizeThreshold The threshold, in bytes, below which items will be
      *                      retained in memory and above which they will be
diff --git a/src/main/java/org/apache/commons/fileupload2/FileItem.java b/src/main/java/org/apache/commons/fileupload2/FileItem.java
index 14478a6..fdbd5af 100644
--- a/src/main/java/org/apache/commons/fileupload2/FileItem.java
+++ b/src/main/java/org/apache/commons/fileupload2/FileItem.java
@@ -69,12 +69,12 @@
     String getContentType();
 
     /**
-     * Returns the original filename in the client's filesystem, as provided by
+     * Returns the original filename in the client's file system, as provided by
      * the browser (or other client software). In most cases, this will be the
      * base file name, without path information. However, some clients, such as
      * the Opera browser, do include path information.
      *
-     * @return The original filename in the client's filesystem.
+     * @return The original filename in the client's file system.
      * @throws InvalidFileNameException The file name contains a NUL character,
      *   which might be an indicator of a security attack. If you intend to
      *   use the file name anyways, catch the exception and use
diff --git a/src/main/java/org/apache/commons/fileupload2/FileItemStream.java b/src/main/java/org/apache/commons/fileupload2/FileItemStream.java
index 7a331bb..c8100b6 100644
--- a/src/main/java/org/apache/commons/fileupload2/FileItemStream.java
+++ b/src/main/java/org/apache/commons/fileupload2/FileItemStream.java
@@ -73,12 +73,12 @@
     String getContentType();
 
     /**
-     * Returns the original filename in the client's filesystem, as provided by
+     * Returns the original filename in the client's file system, as provided by
      * the browser (or other client software). In most cases, this will be the
      * base file name, without path information. However, some clients, such as
      * the Opera browser, do include path information.
      *
-     * @return The original filename in the client's filesystem.
+     * @return The original filename in the client's file system.
      */
     String getName();
 
diff --git a/src/main/java/org/apache/commons/fileupload2/disk/DiskFileItem.java b/src/main/java/org/apache/commons/fileupload2/disk/DiskFileItem.java
index 6f57eb7..b6d85b2 100644
--- a/src/main/java/org/apache/commons/fileupload2/disk/DiskFileItem.java
+++ b/src/main/java/org/apache/commons/fileupload2/disk/DiskFileItem.java
@@ -111,7 +111,7 @@
     private boolean isFormField;
 
     /**
-     * The original filename in the user's filesystem.
+     * The original filename in the user's file system.
      */
     private final String fileName;
 
@@ -168,7 +168,7 @@
      *                      <code>null</code> if not specified.
      * @param isFormField   Whether or not this item is a plain form field, as
      *                      opposed to a file upload.
-     * @param fileName      The original filename in the user's filesystem, or
+     * @param fileName      The original filename in the user's file system, or
      *                      <code>null</code> if not specified.
      * @param sizeThreshold The threshold, in bytes, below which items will be
      *                      retained in memory and above which they will be
@@ -240,9 +240,9 @@
     }
 
     /**
-     * Returns the original filename in the client's filesystem.
+     * Returns the original filename in the client's file system.
      *
-     * @return The original filename in the client's filesystem.
+     * @return The original filename in the client's file system.
      * @throws org.apache.commons.fileupload2.InvalidFileNameException The file name contains a NUL character,
      *   which might be an indicator of a security attack. If you intend to
      *   use the file name anyways, catch the exception and use