diff --git a/src/backend/mod.rs b/src/backend/mod.rs
new file mode 100644
index 0000000..d751816
--- /dev/null
+++ b/src/backend/mod.rs
@@ -0,0 +1,5 @@
+//! Backend: IR to Wasm.
+
+mod stackify;
+pub(crate) use stackify::*;
+
diff --git a/src/backend.rs b/src/backend/stackify.rs
similarity index 98%
rename from src/backend.rs
rename to src/backend/stackify.rs
index 398f7b2..16814b8 100644
--- a/src/backend.rs
+++ b/src/backend/stackify.rs
@@ -1,4 +1,5 @@
-//! IR-to-Wasm transform.
+//! Stackifier-like algorithm to recover (or create) structured
+//! control flow out of a CFG.
 
 use crate::{cfg::CFGInfo, ir::*};
 use log::debug;
@@ -210,3 +211,5 @@ impl Shape {
         Shape::None
     }
 }
+
+