diff --git a/flashrom.8 b/flashrom.8
index c7a6c69..4e6ab55 100644
--- a/flashrom.8
+++ b/flashrom.8
@@ -683,7 +683,8 @@
 .sp
 An optional
 .B spispeed
-parameter specifies the frequency of the SPI bus. Syntax is
+parameter specifies the frequency of the SPI bus. The firmware on the device needs to be 5.0.0 or newer.
+Syntax is
 .sp
 .B "  flashrom \-p dediprog:spispeed=frequency"
 .sp