diff --git a/README.md b/README.md
index 93fe544f..dc0b459e 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Done:
 
 Major TODOs:
 
-- Security, especially DOS protections
+- Security, especially DoS protections
 - Performance
 - Better packet loss detection
 - Connection migration
diff --git a/ackhandler/received_packet_handler_test.go b/ackhandler/received_packet_handler_test.go
index 16f865b4..5a4bb54f 100644
--- a/ackhandler/received_packet_handler_test.go
+++ b/ackhandler/received_packet_handler_test.go
@@ -325,7 +325,7 @@ var _ = Describe("receivedPacketHandler", func() {
 			Expect(handler.lowestInReceivedTimes).To(Equal(protocol.PacketNumber(4)))
 		})
 
-		// this prevents a DOS where a client sends us an unreasonably high LeastUnacked value
+		// this prevents a DoS where a client sends us an unreasonably high LeastUnacked value
 		It("does not garbage collect packets higher than the LargestObserved packet number", func() {
 			err := handler.ReceivedPacket(10)
 			Expect(err).ToNot(HaveOccurred())
diff --git a/ackhandler/sent_packet_handler_test.go b/ackhandler/sent_packet_handler_test.go
index 8eb81975..59cc5514 100644
--- a/ackhandler/sent_packet_handler_test.go
+++ b/ackhandler/sent_packet_handler_test.go
@@ -211,7 +211,7 @@ var _ = Describe("SentPacketHandler", func() {
 		})
 	})
 
-	Context("DOS mitigation", func() {
+	Context("DoS mitigation", func() {
 		It("checks the size of the packet history, for unacked packets", func() {
 			for i := protocol.PacketNumber(1); i < protocol.MaxTrackedSentPackets+10; i++ {
 				packet := Packet{PacketNumber: protocol.PacketNumber(i), Frames: []frames.Frame{&streamFrame}, Length: 1}
diff --git a/protocol/server_parameters.go b/protocol/server_parameters.go
index c2ab1ad8..511bb469 100644
--- a/protocol/server_parameters.go
+++ b/protocol/server_parameters.go
@@ -64,7 +64,7 @@ const MaxTrackedReceivedPackets = 2 * DefaultMaxCongestionWindow
 const MaxTrackedReceivedAckRanges = DefaultMaxCongestionWindow
 
 // MaxStreamFrameSorterGaps is the maximum number of gaps between received StreamFrames
-// prevents DOS attacks against the streamFrameSorter
+// prevents DoS attacks against the streamFrameSorter
 const MaxStreamFrameSorterGaps = 1000
 
 // CryptoMaxParams is the upper limit for the number of parameters in a crypto message.
diff --git a/stream_frame_sorter_test.go b/stream_frame_sorter_test.go
index ebdbdf95..f8b70c2c 100644
--- a/stream_frame_sorter_test.go
+++ b/stream_frame_sorter_test.go
@@ -395,7 +395,7 @@ var _ = Describe("StreamFrame sorter", func() {
 				})
 			})
 
-			Context("DOS protection", func() {
+			Context("DoS protection", func() {
 				It("errors when too many gaps are created", func() {
 					for i := 0; i < protocol.MaxStreamFrameSorterGaps; i++ {
 						f := &frames.StreamFrame{