diff --git a/patches/README.md b/patches/README.md
index c4377f8..bec41eb 100644
--- a/patches/README.md
+++ b/patches/README.md
@@ -27,6 +27,7 @@ match exactly. Naming: `0002` = infra, `0010+` = one aspect each.
 | 0023-cpu-microcode | CPU microcode revision (IA32_UCODE_REV), vendor-positioned |
 | 0024-smbios-bios-type0 | SMBIOS type0 BIOS vendor/version/date + type1 system manufacturer/product (real-OEM or Hyper-V persona) |
 | 0025-smbios-ports-slots | SMBIOS type 8 (port connectors) + type 9 (expansion slots) default set |
+| 0026-cpuid-leaf15 | CPUID leaf 0x15 (TSC / nominal core-crystal ratio), Intel-only |
 
 ## The PCI-id problem (why 0018 is careful)