diff --git a/README.org b/README.org
index 7539d80..f95f5f5 100644
--- a/README.org
+++ b/README.org
@@ -1,7 +1,12 @@
-#TITLE: file title
+without latex delimiters the =_{i=1}= in =\sum_{i=1}^n a_n= is interpreted as subscript.
+we support =\(...\)=, =\[...\]=, =$$...$$= and =\begin{$env}...\end{$env}= as latex fragment delimiters.
 
-* Table of contents :TOC:
-- [[#title][Title]]
-
-* Title
-Lorem ipsum...
\ No newline at end of file
+- \sum_{i=1}^n a_n (without latex delimiter)
+- \(\sum_{i=1}^n a_n\)
+- \[\sum_{i=1}^n a_n\]
+- $$\sum_{i=1}^n a_n$$
+- \begin{xyz}\sum_{i=1}^n a_n\end{xyz}
+- \begin{xyz}
+  \sum_{i=1}^n a_n
+  \end{xyz}
+- $2 + 2$, $3 - 3$
\ No newline at end of file