diff --git a/en/03_Drawing_a_triangle/00_Setup/00_Base_code.adoc b/en/03_Drawing_a_triangle/00_Setup/00_Base_code.adoc
index eeaf0702..a5ad4232 100644
--- a/en/03_Drawing_a_triangle/00_Setup/00_Base_code.adoc
+++ b/en/03_Drawing_a_triangle/00_Setup/00_Base_code.adoc
@@ -38,6 +38,19 @@ import vulkan_hpp;
 #include <cstdlib>
 
 class HelloTriangleApplication {
+----
+
+The `#if defined(__INTELLISENSE__) || !defined(USE_CPP20_MODULES)` block picks
+between two ways of pulling in the Vulkan-Hpp API. When `USE_CPP20_MODULES` is
+defined, we `import vulkan_hpp;` as a C++20 module. Visual Studio and VS Code's
+IntelliSense engine doesn't yet understand `import` for modules and will flag
+it as an error even though the code compiles fine, so we fall back to
+including the traditional `<vulkan/vulkan_raii.hpp>` header whenever
+`__INTELLISENSE__` is defined (which IntelliSense itself defines while
+analyzing the code) or when modules are turned off entirely.
+
+[,c++]
+----
 public:
     void run() {
         initVulkan();