diff --git a/src/albatross.mllib b/src/albatross.mllib
index 42c6b00..54e58a8 100644
--- a/src/albatross.mllib
+++ b/src/albatross.mllib
@@ -8,4 +8,5 @@ Vmm_core
 Vmm_resources
 Vmm_trie
 Vmm_unix
-Vmm_compress
\ No newline at end of file
+Vmm_compress
+Vmm_ring
diff --git a/src/vmm_ring.mli b/src/vmm_ring.mli
new file mode 100644
index 0000000..14dc7ec
--- /dev/null
+++ b/src/vmm_ring.mli
@@ -0,0 +1,9 @@
+(* (c) 2018 Hannes Mehnert, all rights reserved *)
+
+type t
+
+val create : ?size:int -> unit -> t
+
+val write : t -> Ptime.t * string -> unit
+val read : t -> (Ptime.t * string) list
+val read_history : t -> Ptime.t -> (Ptime.t * string) list