diff --git a/man2/mmap.2 b/man2/mmap.2
index 7097ea9ce..e703ce77c 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2
@@ -455,6 +455,10 @@ wrapper function invokes
 with a suitably adjusted value for
 .IR offset .
 
+On some hardware architectures (e.g., x86),
+.BR PROT_WRITE
+implies
+.BR PROT_READ .
 It is architecture dependent whether
 .B PROT_READ
 implies
diff --git a/man2/mprotect.2 b/man2/mprotect.2
index f11affa04..a21f6507b 100644
--- a/man2/mprotect.2
+++ b/man2/mprotect.2
@@ -124,6 +124,10 @@ Whether
 has any effect different from
 .B PROT_READ
 is architecture and kernel version dependent.
+On some hardware architectures (e.g., x86),
+.BR PROT_WRITE
+implies
+.BR PROT_READ .
 
 POSIX.1-2001 says that an implementation may permit access
 other than that specified in