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-rw-r--r--docs/aoa/fs.rst6
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diff --git a/docs/aoa/fs.rst b/docs/aoa/fs.rst
index 8123bf1d..4d5dc100 100644
--- a/docs/aoa/fs.rst
+++ b/docs/aoa/fs.rst
@@ -53,3 +53,9 @@ Example to only show /dev/sdb mount points:
[fs]
show=/dev/sdb.*
+
+Filtering is based on regular expression. Please be sure that your regular
+expression works as expected. You can use an online tool like `regex101`_ in
+order to test your regular expression.
+
+.. _regex101: https://regex101.com/ \ No newline at end of file