diff --git a/doc/source/ch07_simulation.rst b/doc/source/ch07_simulation.rst
index 2d4d6e9e6a6f1a9d6dd1898f40b704d7fe533ad2..be02c8c129f8a976063a31a00f1eb1550f247b5f 100644
--- a/doc/source/ch07_simulation.rst
+++ b/doc/source/ch07_simulation.rst
@@ -23,3 +23,25 @@ Simulation data path
 
 .. note::
     Presently, the ``CsstMsDataManager`` only supports ``C5.2`` simulation.
+
+
+Naming conventions
+------------------
+
+.. code-block:: python
+
+    import re
+    pattern = re.compile(
+        r"CSST_"
+        r"(?P<facility>[A-Z]+)_"
+        r"(?P<project>[A-Z]+)_"
+        r"(?P<data_type>[A-Z]+)_"
+        r"(?P<t_start>[0-9]{14})_"
+        r"(?P<t_stop>[0-9]{14})_"
+        r"(?P<obs_id>[0-9]{9})_"
+        r"(?P<detector>[0-9]{2})_"
+        r"L(?P<level>[0-9]+)_"
+        r"(?P<version>[A-Z0-9]+).fits"
+    )
+    mo = re.search(pattern, r"CSST_MSC_MS_SCI_20270626203558_20270626203828_100000066_01_L0_1.fits")
+    print(mo.groupdict())