diff --git a/content/posts/2018-04-07-thinkpad-coreboot-part1.md b/content/posts/2018-04-07-thinkpad-coreboot-part1.md
index ff9d3d8..3550a08 100644
--- a/content/posts/2018-04-07-thinkpad-coreboot-part1.md
+++ b/content/posts/2018-04-07-thinkpad-coreboot-part1.md
@@ -81,7 +81,7 @@ During the series, I will use the following tools:
     -   a 500°C tested working surface
 -   Reading and writing to the chip
     -   Chinese SOIC8 test clip
-    -   Raspberry Pi[ref]You can use any other SPI programmer which is supported by flashrom, or even write your own program and use unsupported programmers. The protocol is not that complex.[/ref]
+    -   Raspberry Pi[^spi]
     -   flashrom --- software to flash and read over SPI
     -   Some really tiny copper cables and some jumper wires
     -   soldering iron
@@ -324,3 +324,4 @@ setting up coreboot write a message below, or use the contact buttons to the rig
 
 
 [^uefi]: I know it's actually UEFI based, but I'll keep calling it BIOS as the search term is more common.
+[^spi]: You can use any other SPI programmer which is supported by flashrom, or even write your own program and use unsupported programmers. The protocol is not that complex.