diff --git a/Dockerfile b/Dockerfile
index 026abb3..033cd9a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ COPY site/nginx.conf /etc/nginx/conf.d/default.conf
 COPY site/ /usr/share/nginx/html/
 COPY README.md /usr/share/nginx/html/
 COPY SPEC.md /usr/share/nginx/html/
+COPY CHANGELOG.md /usr/share/nginx/html/
 COPY docs/ /usr/share/nginx/html/docs/
 COPY script/install /usr/share/nginx/html/install
 EXPOSE 80
diff --git a/site/docs.html b/site/docs.html
index d2ee8f2..edddb3b 100644
--- a/site/docs.html
+++ b/site/docs.html
@@ -91,6 +91,7 @@ <h4 class="text-xs font-semibold text-slate-500 uppercase tracking-wider mb-4">D
                     <a href="docs.html" data-doc="README.md" class="doc-link block py-1.5 px-3 rounded-md text-slate-400 hover:text-white hover:bg-slate-800/50 transition-colors">Getting Started</a>
                     <a href="docs.html#github-actions" data-doc="docs/github-actions.md" class="doc-link block py-1.5 px-3 rounded-md text-slate-400 hover:text-white hover:bg-slate-800/50 transition-colors">GitHub Actions</a>
                     <a href="docs.html#spec" data-doc="SPEC.md" class="doc-link block py-1.5 px-3 rounded-md text-slate-400 hover:text-white hover:bg-slate-800/50 transition-colors">Specification</a>
+                    <a href="docs.html#changelog" data-doc="CHANGELOG.md" class="doc-link block py-1.5 px-3 rounded-md text-slate-400 hover:text-white hover:bg-slate-800/50 transition-colors">Changelog</a>
                 </nav>
                 <h4 class="text-xs font-semibold text-slate-500 uppercase tracking-wider mb-4">On this page</h4>
                 <nav id="toc" class="space-y-1 text-sm text-slate-400"></nav>
@@ -108,6 +109,7 @@ <h4 class="text-xs font-semibold text-slate-500 uppercase tracking-wider mb-4">O
             '': 'README.md',
             'github-actions': 'docs/github-actions.md',
             'spec': 'SPEC.md',
+            'changelog': 'CHANGELOG.md',
         };
 
         // Reverse map: file path → hash (for intercepting markdown links)