diff --git a/docs/2023-04-17-naming.html b/docs/2023-04-17-naming.html
index 9f31cdd..9b5924b 100644
--- a/docs/2023-04-17-naming.html
+++ b/docs/2023-04-17-naming.html
@@ -78,6 +78,17 @@
       backup (as they say, idk if true or not, but less folder mean less
       complicated to me).
     </p>
+    <h2>
+      <a
+        id="user-content-time-variable"
+        class="anchor"
+        aria-hidden="true"
+        href="#time-variable"
+        ><span aria-hidden="true" class="octicon octicon-link"></span></a
+      >Time variable
+    </h2>
+    <p>Add time postfix to make sense.</p>
+    <p>Instead of <code>create_at</code>, use <code>create_at_ms</code>.</p>
 
     <div>
       Feel free to ask me via
diff --git a/posts/2023-04-17-naming.md b/posts/2023-04-17-naming.md
index e2b3712..befb004 100644
--- a/posts/2023-04-17-naming.md
+++ b/posts/2023-04-17-naming.md
@@ -11,3 +11,9 @@ Personally, I always add timestamp and extra data in filename to avoid duplicate
 Example filename: `yyyy/mm/dd/{user_id}-{timestamp}-{extra}.ext`
 
 Be careful with `/`, too much nested folder is no good for backup (as they say, idk if true or not, but less folder mean less complicated to me).
+
+## Time variable
+
+Add time postfix to make sense.
+
+Instead of `create_at`, use `create_at_ms`.