diff --git a/src/generator/qbe.rs b/src/generator/qbe.rs
index 8125c29..4dd3125 100644
--- a/src/generator/qbe.rs
+++ b/src/generator/qbe.rs
@@ -46,6 +46,8 @@ impl Generator for QbeGenerator {
             datadefs: Vec::new(),
             typedefs: Vec::new(),
         };
+
+        // TODO: use `qbe::Module` API instead of writing to the buffer directly
         let mut buf = String::new();
 
         for def in &prog.structs {