diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # PCIexpress-KiCad
 PCI Express™ libraries and templates for KiCad
-Made using guidelines from PCI Express™ Card Electromechanical Specification Rev. 1.2
+Made using guidelines from PCI Express™ Card Electromechanical Specification Rev. 1.2 and PCI Express™ M.2 Specification Revision 1.0
 
 Updated for KiCad 9.0.1