diff --git a/app/IR.hs b/app/IR.hs
index a46bd3a..9a78e84 100644
--- a/app/IR.hs
+++ b/app/IR.hs
@@ -1,4 +1,18 @@
-module IR (
-) where
+module IR where
 
+import Data.Text
 
+-- Html and Math tags come with their data because they are leaves for us
+-- We aren't parsing that if we can avoid it
+data Tag = Heading {level :: Int} | Paragraph | Blockquote | Code | Html {html :: Text} | Anchor | Italic | Bold | Math {mathML :: Text}
+
+data Data = Ast {ast :: AST} | Text {text :: Text}
+
+data AST = AST {tag :: Tag, child :: [Data]}
+
+-- for processing math
+-- https://hackage.haskell.org/package/typst-0.6.1/docs/Typst-Parse.html#v:parseTypst
+-- and
+-- https://hackage.haskell.org/package/typst-symbols-0.1.7/docs/Typst-Symbols.html
+-- are going to be used for handling typst and
+-- texmath for latex handling
diff --git a/app/Markdown.hs b/app/Markdown.hs
index 568c185..6a1333c 100644
--- a/app/Markdown.hs
+++ b/app/Markdown.hs
@@ -1,4 +1,4 @@
-module Markdown (
-) where
-
+module Markdown where
 
+-- https://spec.commonmark.org/0.31.2/
+-- https://hackage.haskell.org/package/parsec
diff --git a/app/Restruct.hs b/app/Restruct.hs
index 2839524..2fd3e42 100644
--- a/app/Restruct.hs
+++ b/app/Restruct.hs
@@ -1,4 +1,4 @@
-module Restruct (
-) where
-
+module Restruct where
 
+-- https://docutils.sourceforge.io/rst.html
+-- https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html
diff --git a/psb.cabal b/psb.cabal
index 3e20f64..0f9ef17 100644
--- a/psb.cabal
+++ b/psb.cabal
@@ -35,7 +35,7 @@ executable psb
 
     -- Other library packages from which modules are imported.
     -- https://hackage.haskell.org/package/texmath
-    build-depends:    base >=4.17.2.1, mustache >=2.4.2, pandoc >=3.2.1, shake >= 0.19.8, deriving-aeson >= 0.2.9, aeson, text, time, unordered-containers, yaml, parsec >= 3.1.18.0
+    build-depends:    base >=4.17.2.1, mustache >=2.4.2, pandoc >=3.2.1, shake >= 0.19.8, deriving-aeson >= 0.2.9, aeson, text, time, unordered-containers, yaml, parsec >= 3.1.18.0, typst >= 0.6.1, typst-symbols >= 0.1.7
 
     -- Directories containing source files.
     hs-source-dirs:   app