diff --git a/bigstringaf.descr b/bigstringaf.descr
deleted file mode 100644
index 4e8382a..0000000
--- a/bigstringaf.descr
+++ /dev/null
@@ -1,9 +0,0 @@
-Bigstring intrinsics and fast blits based on memcpy/memmove
-
-The OCaml compiler has a bunch of intrinsics for Bigstrings, but they're not
-widely-known, sometimes misused, and so programs that use Bigstrings are slower
-than they have to be. And even if a library got that part right and exposed the
-intrinsics properly, the compiler doesn't have any fast blits between
-Bigstrings and other string-like types.
-
-So here they are. Go crazy.
diff --git a/bigstringaf.opam b/bigstringaf.opam
index 0d0af9f..36ef484 100644
--- a/bigstringaf.opam
+++ b/bigstringaf.opam
@@ -1,24 +1,34 @@
-opam-version: "1.2"
+opam-version: "2.0"
 maintainer: "Spiros Eliopoulos <spiros@inhabitedtype.com>"
 authors: [ "Spiros Eliopoulos <spiros@inhabitedtype.com>" ]
 license: "BSD-3-clause"
 homepage: "https://github.com/inhabitedtype/bigstringaf"
 bug-reports: "https://github.com/inhabitedtype/bigstringaf/issues"
-dev-repo: "https://github.com/inhabitedtype/bigstringaf.git"
+dev-repo: "git+https://github.com/inhabitedtype/bigstringaf.git"
 build: [
   ["jbuilder" "subst" "-p" name] {pinned}
   ["jbuilder" "build" "-p" name "-j" jobs]
-]
-build-test: [
-  ["jbuilder" "runtest" "-p" name]
+  ["jbuilder" "runtest" "-p" name] {with-test}
 ]
 depends: [
   "jbuilder" {build & >= "1.0+beta10"}
-  "alcotest" {test}
+  "alcotest" {with-test}
   "base-bigarray"
+  "ocaml" {>= "4.03.0"}
 ]
 depopts: [
   "mirage-xen-posix"
   "ocaml-freestanding"
 ]
-available: [ ocaml-version >= "4.03.0" ]
+synopsis: "Bigstring intrinsics and fast blits based on memcpy/memmove"
+description: """
+Bigstring intrinsics and fast blits based on memcpy/memmove
+
+The OCaml compiler has a bunch of intrinsics for Bigstrings, but they're not
+widely-known, sometimes misused, and so programs that use Bigstrings are slower
+than they have to be. And even if a library got that part right and exposed the
+intrinsics properly, the compiler doesn't have any fast blits between
+Bigstrings and other string-like types.
+
+So here they are. Go crazy.
+"""
\ No newline at end of file