diff --git a/redstring/library.py b/redstring/library.py
index a3eecbb..6cc23b6 100644
--- a/redstring/library.py
+++ b/redstring/library.py
@@ -14,10 +14,11 @@ from redstring.parser import (
 )
 
 
-def generate_index_document(directory: str) -> Document:
+def generate_index_document(config) -> Document:
     """
     Generate a document describing a document collection.
     """
+    directory = config['root']
     categories: dict = {}
 
     # categories = {
@@ -35,11 +36,17 @@ def generate_index_document(directory: str) -> Document:
         with open(os.path.join(directory, filename)) as f:
             document: Document = load(f)
 
-        # Check if this document specifies a tab, and create it if necessary.
+        # Check if this document specifies a tab.
         if category_tag := document.get_tag('category'):
             category_name = category_tag.value
         else:
             category_name = 'index'
+
+        # Skip hidden tabs in guest mode.
+        if (not config['edit']) and (category_name in config.get('hidden_tabs', [])):
+            continue
+
+        # Create it if necessary.
         if category_name not in categories:
             categories[category_name] = {}
         destination_category = categories[category_name]
@@ -72,7 +79,7 @@ def generate_index_document(directory: str) -> Document:
 
         destination_topic.append((doc_id, doc_title))
 
-    # Build an index document
+    # Build an index document.
     def document_link(info):
         doc_id, doc_title = info
         return (
diff --git a/redstring/server.py b/redstring/server.py
index f6dad93..bd7e4f8 100644
--- a/redstring/server.py
+++ b/redstring/server.py
@@ -60,7 +60,7 @@ def root():
 
 @app.route('/index/', methods=['GET'])
 def index():
-    document = generate_index_document(current_app.config['root'])
+    document = generate_index_document(current_app.config)
     return render_template('doc.jinja', document=document, index=True)
 
 
@@ -179,6 +179,7 @@ def read_config(app, path):
         config = json.load(f)
     app.config['root'] = config['root']
     app.config['edit'] = config['edit']
+    app.config['hidden_tabs'] = config.get('hidden_tabs', [])
     return config