diff --git a/inweb2noweb.scm b/inweb2noweb.scm
new file mode 100644
index 0000000..e5a4404
--- /dev/null
+++ b/inweb2noweb.scm
@@ -0,0 +1,21 @@
+(use-modules (guix build utils))
+
+;; These set of substitutions convert most of the inweb markup syntax
+;; to noweb markup syntax, but some parts still need to be converted by hand.
+
+(substitute* (find-files "." "\\.nw$")
+  (("^@h (.*)\n$" all header)
+   (string-append "@ \\section{" header "}\n"))
+  (("^=.*\n$") "<<*>>=\n")
+  (("^@define ") "#define ")
+  (("^@enum ") "enum ")
+  (("^@d ") "#define ")
+  (("^@e ") "enum ")
+  (("@<") "<<")
+  (("@> =") ">>=")
+  (("@>") ">>")
+  (("@ =") "<<*>>=")
+  (("\\|(.*)\\|" all keyword)
+   (string-append "[[" keyword "]]"))
+  (("\\[\\[\\]\\]") "||"))
+