diff --git a/include/sirit/sirit.h b/include/sirit/sirit.h
index 499f068..7a5b265 100644
--- a/include/sirit/sirit.h
+++ b/include/sirit/sirit.h
@@ -174,6 +174,11 @@ public:
     /// Returns with no value from a function with void return type.
     Ref Return();
 
+    // Debug
+
+    /// Assign a name string to a reference.
+    void Name(Ref target, const std::string& name);
+
     // Literals
     static Operand* Literal(std::uint32_t value);
     static Operand* Literal(std::uint64_t value);
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index dca3b91..fc9bbbf 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -18,6 +18,7 @@ add_library(sirit
     insts/constant.cpp
     insts/function.cpp
     insts/flow.cpp
+    insts/debug.cpp
 )
 target_include_directories(sirit
                            PUBLIC ../include
diff --git a/src/insts/debug.cpp b/src/insts/debug.cpp
new file mode 100644
index 0000000..e12b61c
--- /dev/null
+++ b/src/insts/debug.cpp
@@ -0,0 +1,19 @@
+/* This file is part of the sirit project.
+ * Copyright (c) 2018 ReinUsesLisp
+ * This software may be used and distributed according to the terms of the GNU
+ * Lesser General Public License version 2.1 or any later version.
+ */
+
+#include "sirit/sirit.h"
+#include "insts.h"
+
+namespace Sirit {
+
+void Module::Name(Ref target, const std::string& name) {
+    Op* op{new Op(spv::Op::OpName)};
+    op->Add(target);
+    op->Add(name);
+    debug.push_back(std::unique_ptr<Op>(op));
+}
+
+} // namespace Sirit
diff --git a/src/sirit.cpp b/src/sirit.cpp
index 4eeb411..7f01cb6 100644
--- a/src/sirit.cpp
+++ b/src/sirit.cpp
@@ -53,7 +53,9 @@ std::vector<u8> Module::Assemble() const {
 
     // TODO write execution mode
 
-    // TODO write debug symbols
+    for (const auto& debug_symbol : debug) {
+        debug_symbol->Write(stream);
+    }
 
     // TODO write annotations
 
diff --git a/tests/main.cpp b/tests/main.cpp
index 4261ab3..f7542c0 100644
--- a/tests/main.cpp
+++ b/tests/main.cpp
@@ -51,15 +51,16 @@ public:
                            Constant(TypeFloat(32), Literal(50.0f))});
         ConstantNull(TypeVector(TypeInt(64, false), 4));
 
+        auto cont{Label()};
         auto skip{Label()};
-        auto end{Label()};
+        Name(skip, "skip");
         auto main_type{TypeFunction(TypeVoid())};
         auto main_func{Emit(Function(TypeVoid(), spv::FunctionControlMask::MaskNone, main_type))};
         Emit(Label());
-        Emit(BranchConditional(ConstantTrue(TypeBool()), skip, end, 5, 0));
+        Emit(BranchConditional(ConstantTrue(TypeBool()), cont, skip, 5, 0));
+        Emit(cont);
+        Emit(Branch(skip));
         Emit(skip);
-        Emit(Branch(end));
-        Emit(end);
         Emit(Return());
         Emit(FunctionEnd());