diff --git a/docs/2023-06-25-useful-tools.html b/docs/2023-06-25-useful-tools.html
index 83ca42e..a77d5a2 100644
--- a/docs/2023-06-25-useful-tools.html
+++ b/docs/2023-06-25-useful-tools.html
@@ -511,6 +511,11 @@
           >https://github.com/itchyny/gojq</a
         >
       </li>
+      <li>
+        <a href="https://github.com/plantuml/plantuml"
+          >https://github.com/plantuml/plantuml</a
+        >
+      </li>
     </ul>
     <p>Memory</p>
     <ul>
diff --git a/posts/2023-06-25-useful-tools.md b/posts/2023-06-25-useful-tools.md
index f32e78d..30939d9 100644
--- a/posts/2023-06-25-useful-tools.md
+++ b/posts/2023-06-25-useful-tools.md
@@ -123,6 +123,7 @@ Misc
 
 - https://github.com/mikefarah/yq
 - https://github.com/itchyny/gojq
+- https://github.com/plantuml/plantuml
 
 Memory