diff --git a/addrbook.go b/addrbook.go
index c5415f02..ea438120 100644
--- a/addrbook.go
+++ b/addrbook.go
@@ -153,6 +153,7 @@ func (a *AddrBook) OurAddresses() []*NetAddress {
 	return addrs
 }
 
+// NOTE: addr must not be nil
 func (a *AddrBook) AddAddress(addr *NetAddress, src *NetAddress) {
 	a.mtx.Lock()
 	defer a.mtx.Unlock()
diff --git a/pex_reactor.go b/pex_reactor.go
index 2948c58f..b8cb43f8 100644
--- a/pex_reactor.go
+++ b/pex_reactor.go
@@ -130,16 +130,6 @@ func (pexR *PEXReactor) SendAddrs(peer *Peer, addrs []*NetAddress) {
 	peer.Send(PexChannel, struct{ PexMessage }{&pexAddrsMessage{Addrs: addrs}})
 }
 
-// SaveAddrBook saves underlying address book
-func (r *PEXReactor) SaveAddrBook() {
-	r.book.Save()
-}
-
-// AddPeerAddress adds raw NetAddress to the address book
-func (r *PEXReactor) AddPeerAddress(peerAddr, srcAddr *NetAddress) {
-	r.book.AddAddress(peerAddr, srcAddr)
-}
-
 // Ensures that sufficient peers are connected. (continuous)
 func (pexR *PEXReactor) ensurePeersRoutine() {
 	// Randomize when routine starts