diff --git a/introspection.hpp b/introspection.hpp
index 41da873e..97df4def 100644
--- a/introspection.hpp
+++ b/introspection.hpp
@@ -33,8 +33,12 @@ namespace cruft {
         std::string_view pretty_function (__PRETTY_FUNCTION__);
 
 #ifdef __clang__
+        // PRETTY_FUNCTION = std::string_view cruft::type_name() [T = std::__1::vector<int, std::__1::allocator<int> >]
+
         std::string_view const prefix = "[T = ";
 #elif defined(__GNUC__)
+        // PRETTY_FUNCTION = "constexpr std::string_view cruft::type_name() [with T = std::__debug::vector<int>; std::string_view = std::basic_string_view<char>]"
+
         std::string_view prefix = "[with T = ";
 #else
 #error "Unsupported compiler"