diff --git a/libc/src/setjmp/x86_64/setjmp.cpp b/libc/src/setjmp/x86_64/setjmp.cpp
index 28e52712c785d..66d13166d4d46 100644
--- a/libc/src/setjmp/x86_64/setjmp.cpp
+++ b/libc/src/setjmp/x86_64/setjmp.cpp
@@ -6,6 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 
+// We use naked functions to avoid compiler-generated prologue and epilogue.
+// Despite GCC documentation listing this as an unsupported case for extended
+// asm, the generated code is not wrong as we only pass in constant operands
+// to extended asm.
+// See https://github.com/llvm/llvm-project/issues/137055 for related remarks.
+
 #include "hdr/offsetof_macros.h"
 #include "src/__support/common.h"
 #include "src/__support/macros/config.h"