diff --git a/doc/faq.but b/doc/faq.but
index d7ff474e..a790c18d 100644
--- a/doc/faq.but
+++ b/doc/faq.but
@@ -224,8 +224,9 @@ from XP onwards, up to and including Windows 10; and we know of no
 reason why PuTTY should not continue to work on future versions of
 Windows. We provide 32-bit and 64-bit Windows executables for the
 common x86 processor family; see \k{faq-32bit-64bit} for discussion
-of the compatibility issues around that. We also provide executables
-for Windows on Arm processors.
+of the compatibility issues around that. The 32-bit executables
+require a \i{Pentium 4} or newer processor. We also provide
+executables for Windows on Arm processors.
 
 (We used to also provide executables for Windows for the Alpha
 processor, but stopped after 0.58 due to lack of interest.)