diff --git a/lib/wasm/src/environ/dummy.rs b/lib/wasm/src/environ/dummy.rs
index 21ee1d08a3..5077612529 100644
--- a/lib/wasm/src/environ/dummy.rs
+++ b/lib/wasm/src/environ/dummy.rs
@@ -1,4 +1,5 @@
-//! "Dummy" environment for testing wasm translation.
+//! "Dummy" implementations of `ModuleEnvironment` and `FuncEnvironment` for testing
+//! wasm translation.
 
 use cranelift_codegen::cursor::FuncCursor;
 use cranelift_codegen::ir::immediates::Imm64;