diff --git a/.gitignore b/.gitignore
index d88e7067a..697678973 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 /target
 /target_ed
 playground/
+
+/*.ll
diff --git a/README.md b/README.md
index 269e3cc30..72e16f9c4 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,12 @@ pub fn factorial(n: i32) -> i32 {
         return n * factorial(n - 1);
     }
 }
+
+mod hello {
+  pub fn world(ptr: *const u8) -> u8 {
+    return *ptr;
+  }
+}
 ```
 
 ## edb: The edlang builder
diff --git a/lib/edlang_codegen_llvm/src/codegen.rs b/lib/edlang_codegen_llvm/src/codegen.rs
index 41d76cac7..db58553d8 100644
--- a/lib/edlang_codegen_llvm/src/codegen.rs
+++ b/lib/edlang_codegen_llvm/src/codegen.rs
@@ -144,9 +144,7 @@ pub fn compile(session: &Session, program: &ProgramBody) -> Result<PathBuf, Box<
             "edlang-sdk",
         );
 
-        let di_namespace = di_builder
-            .create_namespace(di_unit.get_file().as_debug_info_scope(), &module.name, true)
-            .as_debug_info_scope();
+        let di_namespace = di_unit.get_file().as_debug_info_scope();
 
         let mut module_ctx = ModuleCompileCtx {
             ctx,
@@ -209,13 +207,28 @@ pub fn compile(session: &Session, program: &ProgramBody) -> Result<PathBuf, Box<
 fn compile_module(ctx: &mut ModuleCompileCtx, module_id: DefId) {
     let module = ctx.ctx.program.modules.get(&module_id).unwrap();
     trace!("compiling module: {:?}", module_id);
+
+    let di_namespace = ctx.di_namespace;
+    if module.name != "lib" {
+        ctx.di_namespace = ctx
+            .di_builder
+            .create_namespace(di_namespace, &module.name, true)
+            .as_debug_info_scope();
+    }
+
     for id in module.functions.iter() {
         compile_fn_signature(ctx, *id, true);
     }
 
+    for id in module.modules.iter() {
+        compile_module(ctx, *id);
+    }
+
     for id in module.functions.iter() {
         compile_fn(ctx, *id).unwrap();
     }
+
+    ctx.di_namespace = di_namespace;
 }
 
 fn compile_fn_signature(ctx: &ModuleCompileCtx<'_, '_>, fn_id: DefId, is_definition: bool) {
diff --git a/lib/edlang_ir/src/lib.rs b/lib/edlang_ir/src/lib.rs
index bb9fdbdd0..24203445c 100644
--- a/lib/edlang_ir/src/lib.rs
+++ b/lib/edlang_ir/src/lib.rs
@@ -101,7 +101,7 @@ impl Body {
         }
 
         format!(
-            "{}@{}@{}",
+            "{}${}${}",
             self.name, self.def_id.program_id, self.def_id.id
         )
     }