diff --git a/docs/.vitepress/config/sidebar.ts b/docs/.vitepress/config/sidebar.ts
index f88fd070..fe7f465c 100644
--- a/docs/.vitepress/config/sidebar.ts
+++ b/docs/.vitepress/config/sidebar.ts
@@ -22,8 +22,8 @@ export const sidebar: DefaultTheme.Config['sidebar'] = {
             text: 'Problems & Solutions',
             collapsed: true,
             items: [
-                { text: 'Problem: 2-20', link: '/academic/chemistry/problems/2-20' },
-                { text: 'Problem: 3-2', link: '/academic/chemistry/problems/3-2' },
+                { text: 'Problem: 02-20', link: '/academic/chemistry/problems/2-20' },
+                { text: 'Problem: 03-02', link: '/academic/chemistry/problems/3-2' },
             ],
         },
     ],
diff --git a/docs/academic/chemistry/problems/2-20.md b/docs/academic/chemistry/problems/02-20.md
similarity index 98%
rename from docs/academic/chemistry/problems/2-20.md
rename to docs/academic/chemistry/problems/02-20.md
index 4763a1e2..98dccd10 100755
--- a/docs/academic/chemistry/problems/2-20.md
+++ b/docs/academic/chemistry/problems/02-20.md
@@ -1,4 +1,4 @@
-# Presentation problem: 2-20
+# Presentation problem: 02-20
 
 ## Question