diff --git a/README.md b/README.md
index 30c5169..a92b922 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,10 @@ WASI filesystem is not intended to be used as a virtual API for accessing
 arbitary resources. Unix's "everything is a file" philosophy is in conflict
 with the goals of supporting modularity and the principle of least authority.
 
+Many of the ideas related to doing capability-based filesystem sandboxing with
+`openat` come from [CloudABI](https://github.com/NuxiNL/cloudabi) and
+[Capsicum](https://wiki.freebsd.org/Capsicum).
+
 ### Goals
 
 The primary goal of WASI filesystem is to allow users to use WASI programs to
diff --git a/wasi-filesystem.wit.md b/wasi-filesystem.wit.md
index ed637e2..d19ef6f 100644
--- a/wasi-filesystem.wit.md
+++ b/wasi-filesystem.wit.md
@@ -11,9 +11,6 @@ Paths are passed as interface-type `string`s, meaning they must consist of
 a sequence of Unicode Scalar Values (USVs). Some filesystems may contain paths
 which are not accessible by this API.
 
-Some of the content and ideas here are derived from
-[CloudABI](https://github.com/NuxiNL/cloudabi).
-
 ## `size`
 ```wit
 /// Size of a range of bytes in memory.