diff --git a/sys/amd64/conf/NOTES b/sys/amd64/conf/NOTES
index 2c9c3fd7b7b..5e486978781 100644
--- a/sys/amd64/conf/NOTES
+++ b/sys/amd64/conf/NOTES
@@ -142,7 +142,7 @@ device		isa
 #
 # AUTO_EOI_2 enables the `automatic EOI' feature for the slave 8259A
 # interrupt controller.  This saves about 0.7-1.25 usec for each interrupt.
-# Automatic EOI is documented not to work for for the slave with the
+# Automatic EOI is documented not to work for the slave with the
 # original i8259A, but it works for some clones and some integrated
 # versions.
 #
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index 092df2b62dd..5bcadf55dfd 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -1771,7 +1771,7 @@ device		puc
 # namely those which use MII-compliant transceivers or implement
 # transceiver control interfaces that operate like an MII.  Adding
 # "device miibus" to the kernel config pulls in support for the generic
-# miibus API, the common support for for bit-bang'ing the MII and all
+# miibus API, the common support for bit-bang'ing the MII and all
 # of the PHY drivers, including a generic one for PHYs that aren't
 # specifically handled by an individual driver.  Support for specific
 # PHYs may be built by adding "device mii", "device mii_bitbang" if
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES
index 3c1d1b8225a..1cf8a34a8eb 100644
--- a/sys/i386/conf/NOTES
+++ b/sys/i386/conf/NOTES
@@ -290,7 +290,7 @@ device		isa
 #
 # AUTO_EOI_2 enables the `automatic EOI' feature for the slave 8259A
 # interrupt controller.  This saves about 0.7-1.25 usec for each interrupt.
-# Automatic EOI is documented not to work for for the slave with the
+# Automatic EOI is documented not to work for the slave with the
 # original i8259A, but it works for some clones and some integrated
 # versions.
 #