diff --git a/Clock Port.md b/Clock Port.md
index 5dc0479..29de891 100644
--- a/Clock Port.md	
+++ b/Clock Port.md	
@@ -7,6 +7,8 @@ include_toc: true
 
 The Sentinel 65X clock port is a small, 28-pin female pin header on the mainboard, which exposes the system's debug serial line, I2C bus, reset and main interrupt lines, `PHI2` clock signal, and a 64-address memory-mapped I/O region, mapped to memory beginning at `0x00DFC0`. This region of uncommitted expansion is reserved for the use of user-installed clock port accessories.
 
+The clock port's pin header has two rows, and a pin and row pitch of 2.54mm.
+
 ## Pinout
 
 The clock port's pinout, as seen from above, is shown in the following table: