diff --git a/cranelift/README.md b/cranelift/README.md
index 800dc6cc02..82ac7912dd 100644
--- a/cranelift/README.md
+++ b/cranelift/README.md
@@ -21,7 +21,7 @@ implements a toy language.
 [SimpleJIT Demo]: https://github.com/CraneStation/simplejit-demo
 
 For an example of how to use Cranelift to run WebAssembly code, see
-[Wasmtime], which implements a standalone VM using Cranelift.
+[Wasmtime], which implements a standalone, embeddable, VM using Cranelift.
 
 [Wasmtime]: https://github.com/CraneStation/wasmtime
 
diff --git a/lib/wasm/src/environ/dummy.rs b/lib/wasm/src/environ/dummy.rs
index a31a750b56..fc7db3af38 100644
--- a/lib/wasm/src/environ/dummy.rs
+++ b/lib/wasm/src/environ/dummy.rs
@@ -1,5 +1,9 @@
 //! "Dummy" implementations of `ModuleEnvironment` and `FuncEnvironment` for testing
-//! wasm translation.
+//! wasm translation. For complete implementations of `ModuleEnvironment` and
+//! `FuncEnvironment`, see [wasmtime-environ] in [Wasmtime].
+//!
+//! [wasmtime-environ]: https://crates.io/crates/wasmtime-environ
+//! [Wasmtime]: https://github.com/CraneStation/wasmtime
 
 use cast;
 use cranelift_codegen::cursor::FuncCursor;
diff --git a/lib/wasm/src/environ/spec.rs b/lib/wasm/src/environ/spec.rs
index 7aeeb43c92..9f3c2ba165 100644
--- a/lib/wasm/src/environ/spec.rs
+++ b/lib/wasm/src/environ/spec.rs
@@ -1,5 +1,11 @@
 //! All the runtime support necessary for the wasm to cranelift translation is formalized by the
 //! traits `FunctionEnvironment` and `ModuleEnvironment`.
+//!
+//! There are skeleton implementations of these traits in the `dummy` module, and complete
+//! implementations in [Wasmtime].
+//!
+//! [Wasmtime]: https://github.com/CraneStation/wasmtime
+
 use cranelift_codegen::cursor::FuncCursor;
 use cranelift_codegen::ir::immediates::Offset32;
 use cranelift_codegen::ir::{self, InstBuilder};