diff --git a/README.md b/README.md
index 0293572..9e1ac11 100644
--- a/README.md
+++ b/README.md
@@ -37,5 +37,6 @@ JP1
  - GPIO13, GPIO14 , GPIO19 and GPIO27 are reserved for an Eink display.
  - GPIO9 and GPIO10 are reserved for the QuadIO flash mode.
  - GPIO25 and GPIO26 are reserved for an unknown device.
+ - GPIO35 is reserved for the unpopulated and unknown U7.
  - There are traces and footprints for a buzzer.
  - There are traces and footprints for a fifth switch.
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