diff --git a/xla/tools/hlo_opt/gpu_specs/README.md b/xla/tools/hlo_opt/gpu_specs/README.md
index 6586c2fbe3ca2..90a62a563248f 100644
--- a/xla/tools/hlo_opt/gpu_specs/README.md
+++ b/xla/tools/hlo_opt/gpu_specs/README.md
@@ -1,7 +1,9 @@
-The specs in this folder are obtained by calling the appropriate override of
-`StreamExecutor::CreateDeviceDescription`, then turned into
-`GpuDeviceInfoProto`. (E.g., for NVIDIA GPUs, we call
-`CudaExecutor::CreateDeviceDescription`.) The specs are useful when compiling
-with the flag `--xla_gpu_target_config_filename`. Since a hardware generation
-may have several SKUs, a spec may not be identical to what we would get on a
-particular machine, but it will be "close enough".
+The specs in this folder are obtained by calling
+`Compiler::TargetConfig::ToString()`, which turns the config into a
+`GpuTargetConfigProto`, and then to a `std::string`. Most of the spec is the
+device description as a proto `GpuDeviceInfoProto`.
+
+The specs are useful when compiling with the flag
+`--xla_gpu_target_config_filename`. Since a hardware generation may have several
+SKUs, a spec may not be identical to what we would get on a particular machine,
+but it will be "close enough".