diff --git a/src/doc/avrdude.texi b/src/doc/avrdude.texi
index f6a1fa5b..f1d7492e 100644
--- a/src/doc/avrdude.texi
+++ b/src/doc/avrdude.texi
@@ -3926,7 +3926,7 @@ part
     family_id        = <id>;                  # quoted string, e.g., "megaAVR" or "tinyAVR"
     prog_modes       = PM_<i/f> @{| PM_<i/f>@}  # interfaces, e.g., PM_SPM|PM_ISP|PM_HVPP|PM_debugWIRE
     mcuid            = <num>;                 # unique id in 0..2039 for 8-bit AVRs
-    archnum          = <num>;                 # avr-gcc architecture number for the part
+    archnum          = <num>;                 # avr-gcc architecture number; -1 if not 8-bit AVR
     n_interrupts     = <num>;                 # number of interrupts, used for vector bootloaders
     n_page_erase     = <num>;                 # if set, number of pages erased during SPM erase
     n_boot_sections  = <num>;                 # Number of boot sections