diff --git a/intro_notes.txt b/intro_notes.txt
new file mode 100644
index 0000000..8dc1d18
--- /dev/null
+++ b/intro_notes.txt
@@ -0,0 +1,7 @@
+inspecting error information
+MD_CodeLocFromNode, (MD_Node from MD_Error)
+nil nodes
+tips on generating C
+concat
+PushStringF?
+match flags (which are relevant)