diff --git a/renderer/fifty_ohm_html_renderer.py b/renderer/fifty_ohm_html_renderer.py
index c73a511..2e316bd 100644
--- a/renderer/fifty_ohm_html_renderer.py
+++ b/renderer/fifty_ohm_html_renderer.py
@@ -6,6 +6,7 @@ from .dash import Dash
 from .formula import Formula
 from .halfwidth_spaces import HalfwidthSpaces
 from .include import Include
+from .index import Index
 from .morse import Morse
 from .nonbreaking_spaces import NonbreakingSpaces, NonbreakingSpacesDots
 from .photo import Photo
@@ -64,6 +65,7 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
             Qso,
             Include,
             Formula,
+            Index,
             *extras,
             **kwargs,
         )
@@ -332,3 +334,7 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
 
     def render_formula(self, token):
         return f"\n$${token.formula}$$\n"
+
+    def render_index(self, token):
+        # For HTML just ignore the index
+        return ""
diff --git a/renderer/index.py b/renderer/index.py
new file mode 100644
index 0000000..6885b47
--- /dev/null
+++ b/renderer/index.py
@@ -0,0 +1,16 @@
+import re
+
+from mistletoe.span_token import SpanToken
+
+
+class Index(SpanToken):
+    """
+    Resolve index commands
+    Identifies "[index:term:subterm]" or "[index:term]"
+    """
+
+    pattern = re.compile(r"[ \t]*\[index:([^:\]\s]+)(?::([^:\]\s]+))?\]")
+
+    def __init__(self, match_object):
+        self.first = match_object.group(1)
+        self.second = match_object.group(2)
diff --git a/test/test_index.py b/test/test_index.py
new file mode 100644
index 0000000..446f076
--- /dev/null
+++ b/test/test_index.py
@@ -0,0 +1,19 @@
+import mistletoe
+import pytest
+
+from renderer.fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
+from test.util import paragraph
+
+
+@pytest.mark.html
+def test_index_html():
+
+    assertions = {
+        "Im Betrieb werden Yagi-Antennen [index:Antenne:Yagi-Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",
+        "Im Betrieb werden Yagi-Antennen[index:Antenne:Yagi-Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",
+        "Im Betrieb werden Yagi-Antennen [index:Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",
+        "Im Betrieb werden Yagi-Antennen[index:Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",
+    }
+
+    for key, value in assertions.items():
+        assert mistletoe.markdown(key, FiftyOhmHtmlRenderer) == paragraph(value)