diff --git a/renderer/tag.py b/renderer/tag.py
index 05d089b..6bdc187 100644
--- a/renderer/tag.py
+++ b/renderer/tag.py
@@ -2,12 +2,24 @@ import re
 
 from mistletoe.block_token import BlockToken, tokenize
 
+captures = [
+    "margin",
+    "indepth",
+    "webmargin",
+    "tipp",
+    "webtipp",
+    "webindepth",
+    "unit",
+    "danger",
+    "webonly",
+    "latexonly",
+]
 
 class Tag(BlockToken):
 
     @staticmethod
     def start(line):
-        return re.match(r"^\s*<[^>]+>", line)
+        return re.match(r"^\s*<("+"|".join(captures)+r")+>", line)
 
     @classmethod
     def read(cls, lines):
diff --git a/test/test_tag.py b/test/test_tag.py
index ba6ab95..967e8f3 100644
--- a/test/test_tag.py
+++ b/test/test_tag.py
@@ -18,7 +18,7 @@ def test_tag_html() :
         "<indepth>\nFoo\n</indepth>" : FiftyOhmHtmlRenderer.render_tag_helper("indepth","<p>Foo</p>",1,0)+'\n',
         "<webmargin>\nFoo\n</webmargin>" : FiftyOhmHtmlRenderer.render_tag_helper("margin","<p>Foo</p>",1,0)+'\n',
         "<tipp>\nFoo\n</tipp>" : FiftyOhmHtmlRenderer.render_tag_helper("tipp","<p>Foo</p>",1,0)+'\n',
-        "<webtipp>\nFoo\n</webtipp>" : FiftyOhmHtmlRenderer.render_tag_helper("webtipp","<p>Foo</p>",1,0)+'\n',
+        "<webtipp>\nFoo\n</webtipp>" : FiftyOhmHtmlRenderer.render_tag_helper("tipp","<p>Foo</p>",1,0)+'\n',
         "<webindepth>\nFoo\n</webindepth>" : FiftyOhmHtmlRenderer.render_tag_helper("indepth","<p>Foo</p>",1,0)+'\n',
         "<unit>\nFoo\n</unit>" : FiftyOhmHtmlRenderer.render_tag_helper("unit","<p>Foo</p>",1,0)+'\n',
         "<danger>\nFoo\n</danger>" : FiftyOhmHtmlRenderer.render_tag_helper("danger","<p>Foo</p>",1,0)+'\n',