diff --git a/net_tcp.go b/net_tcp.go
index 52776295..0396d720 100644
--- a/net_tcp.go
+++ b/net_tcp.go
@@ -25,24 +25,28 @@ type (
 
 // NetTCP returns the IPv4 kernel/networking statistics for TCP datagrams
 // read from /proc/net/tcp.
+// Deprecated: Use github.com/mdlayher/netlink#Conn (with syscall.AF_INET) instead.
 func (fs FS) NetTCP() (NetTCP, error) {
 	return newNetTCP(fs.proc.Path("net/tcp"))
 }
 
 // NetTCP6 returns the IPv6 kernel/networking statistics for TCP datagrams
 // read from /proc/net/tcp6.
+// Deprecated: Use github.com/mdlayher/netlink#Conn (with syscall.AF_INET6) instead.
 func (fs FS) NetTCP6() (NetTCP, error) {
 	return newNetTCP(fs.proc.Path("net/tcp6"))
 }
 
 // NetTCPSummary returns already computed statistics like the total queue lengths
 // for TCP datagrams read from /proc/net/tcp.
+// Deprecated: Use github.com/mdlayher/netlink#Conn (with syscall.AF_INET) instead.
 func (fs FS) NetTCPSummary() (*NetTCPSummary, error) {
 	return newNetTCPSummary(fs.proc.Path("net/tcp"))
 }
 
 // NetTCP6Summary returns already computed statistics like the total queue lengths
 // for TCP datagrams read from /proc/net/tcp6.
+// Deprecated: Use github.com/mdlayher/netlink#Conn (with syscall.AF_INET6) instead.
 func (fs FS) NetTCP6Summary() (*NetTCPSummary, error) {
 	return newNetTCPSummary(fs.proc.Path("net/tcp6"))
 }