diff --git a/firmware/config/boards/nucleo_f413/readme.md b/firmware/config/boards/nucleo_f413/readme.md
index 0abed9a0ec..05a0249448 100644
--- a/firmware/config/boards/nucleo_f413/readme.md
+++ b/firmware/config/boards/nucleo_f413/readme.md
@@ -1,5 +1,7 @@
 NUCLEO-F413ZH
 
+(only?) 100 MHz
+
 320 RAM (256 + 64)
 
 1536 flash looks like one bank which means easy?