diff --git a/src/rocky_man/main.py b/src/rocky_man/main.py
index a10b7c7..0a230a2 100644
--- a/src/rocky_man/main.py
+++ b/src/rocky_man/main.py
@@ -254,6 +254,13 @@ def main():
         help="Use vault directory instead of pub (vault/rocky instead of pub/rocky)",
     )
 
+    parser.add_argument(
+        "--existing-versions",
+        nargs="*",
+        metavar="VERSION",
+        help="List of existing versions to include in root index (e.g., 8.10 9.7)",
+    )
+
     parser.add_argument(
         "--template-dir",
         type=Path,
@@ -333,13 +340,24 @@ def main():
         allow_all_sections=args.allow_all_sections,
     )
 
-    # Scan for existing versions in output directory
-    existing_versions = [
+    # Get existing versions from scan and argument
+    scanned_versions = [
         d.name
         for d in config.output_dir.iterdir()
         if d.is_dir() and re.match(r"\d+\.\d+", d.name)
     ]
-    all_versions = sorted(set(existing_versions + config.versions))
+    arg_versions = args.existing_versions or []
+
+    # Sort versions numerically by (major, minor)
+    def version_key(v):
+        try:
+            major, minor = v.split(".")
+            return (int(major), int(minor))
+        except (ValueError, AttributeError):
+            return (0, 0)
+
+    existing_versions = sorted(set(scanned_versions + arg_versions), key=version_key)
+    all_versions = sorted(set(existing_versions + config.versions), key=version_key)
 
     logger.info("Rocky Man - Rocky Linux Man Page Generator")
     logger.info(f"Versions to process: {', '.join(config.versions)}")
diff --git a/src/rocky_man/web/generator.py b/src/rocky_man/web/generator.py
index 4b08826..03d035f 100644
--- a/src/rocky_man/web/generator.py
+++ b/src/rocky_man/web/generator.py
@@ -292,6 +292,8 @@ class WebGenerator:
                     minors_list = sorted(major_to_minors[major], key=int, reverse=True)
                     if minor_idx < len(minors_list):
                         row.append((major, minors_list[minor_idx]))
+                    else:
+                        row.append(None)  # Empty cell placeholder
                 version_rows.append(row)
 
             html = template.render(
diff --git a/templates/root.html b/templates/root.html
index 6b2f86e..141c5bc 100644
--- a/templates/root.html
+++ b/templates/root.html
@@ -164,7 +164,9 @@
         <div class="version-grid">
             {% for row in version_rows %}
             {% set outer_loop = loop %}
-            {% for major, minor in row %}
+            {% for item in row %}
+            {% if item %}
+            {% set major, minor = item %}
             <a href="{{ major }}.{{ minor }}/index.html" class="version-card{% if not outer_loop.first %} small{% endif %}">
                 <div class="version-number">{{ major }}.{{ minor }}</div>
                 {% if outer_loop.first %}
@@ -172,6 +174,9 @@
                 <div class="version-browse">Browse man pages →</div>
                 {% endif %}
             </a>
+            {% else %}
+            <div></div>
+            {% endif %}
             {% endfor %}
             {% endfor %}
         </div>