diff --git a/ChangeLog.md b/ChangeLog.md
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--- /dev/null
+++ b/ChangeLog.md
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+# Changelog for vinyl-loeb
+
+## v0.0.1.0
+
+* Add `rloeb`.
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright Daniel Firth (c) 2020
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Author name here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
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+# vinyl-loeb
+
+This package defines a version of loeb's theorem for
+[vinyl](https://hackage.haskell.org/package/vinyl).
+
+```{.haskell}
+rloeb :: RMap xs => Rec ((->) (Rec f xs) :. f) xs  -> Rec f xs
+rloeb x = go where go = rmap (($ go) . getCompose) x
+```
+
+This can be used to fill up an extensible record lazily using
+data from the result of the record itself.
+
+```{.haskell}
+type F = [Text, Text]
+
+k :: Rec Thunk F -> Text
+k (Thunk f :& _) = f <> "bar"
+
+f :: Rec ((->) (Rec Thunk F) :. Thunk) F
+f = (Compose $ const $ Thunk $ "foo") :& Compose (Thunk . k) :& RNil
+
+-- > rloeb f
+-- {"foo", "foobar"}
+```
diff --git a/src/Data/Vinyl/Loeb.hs b/src/Data/Vinyl/Loeb.hs
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--- /dev/null
+++ b/src/Data/Vinyl/Loeb.hs
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+{-|
+Module      : Data.Vinyl.Loeb
+License     : MIT
+Maintainer  : dan.firth@homotopic.tech
+Stability   : experimental
+
+Loeb's theorem for vinyl extensible records.
+-}
+{-# LANGUAGE PolyKinds     #-}
+{-# LANGUAGE TypeOperators #-}
+module Data.Vinyl.Loeb (
+  rloeb
+) where
+
+import Data.Vinyl
+import Data.Vinyl.Functor
+
+-- | Version of loeb's theorem for extensible records. Can be
+-- used to fill an extensible record lazily using data from
+-- the result of the record itself.
+rloeb :: RMap xs => Rec ((->) (Rec f xs) :. f) xs  -> Rec f xs
+rloeb x = go where go = rmap (($ go) . getCompose) x
diff --git a/vinyl-loeb.cabal b/vinyl-loeb.cabal
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--- /dev/null
+++ b/vinyl-loeb.cabal
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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.2.
+--
+-- see: https://github.com/sol/hpack
+
+name:           vinyl-loeb
+version:        0.0.1.0
+synopsis:       Loeb's theorem for extensible records.
+category:       Vinyl
+author:         Daniel Firth
+maintainer:     dan.firth@homotopic.tech
+copyright:      2020 Daniel Firth
+license:        MIT
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://gitlab.com/homotopic-tech/vinyl-loab
+
+library
+  exposed-modules:
+      Data.Vinyl.Loeb
+  other-modules:
+      Paths_vinyl_loeb
+  hs-source-dirs:
+      src
+  ghc-options: -Wall -Wcompat -Wincomplete-record-updates -Wincomplete-uni-patterns -Wredundant-constraints
+  build-depends:
+      base >=4.7 && <5
+    , vinyl
+  default-language: Haskell2010