diff --git a/components/filesystem/introduction.rst b/components/filesystem/introduction.rst
index 74aa259c809..2699e028980 100644
--- a/components/filesystem/introduction.rst
+++ b/components/filesystem/introduction.rst
@@ -234,6 +234,21 @@ isAbsolutePath
// return false
$fs->isAbsolutePath('../dir');
+tempnam
+~~~~~~~
+
+.. versionadded:: 2.7
+ The ``tempnam()`` function was introduced in Symfony 2.7.
+
+:method:`Symfony\\Component\\Filesystem\\Filesystem::tempnam` is a drop-in
+replacement for PHP's builtin :phpfunction:`tempnam` function which allows
+you to create a temporary file on a stream if the stream is writable. It
+returns false on failure.
+
+ $tmpFile = $fs->tempnam('ftp://example.com/tmp', 'FOO');
+
+``$tmpFile`` will be the name of the temporary file or false.
+
dumpFile
~~~~~~~~
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