diff --git a/draft-ietf-quic-recovery.md b/draft-ietf-quic-recovery.md
index 9ac12db6aa..405527b728 100644
--- a/draft-ietf-quic-recovery.md
+++ b/draft-ietf-quic-recovery.md
@@ -1106,7 +1106,7 @@ OnAckReceived(ack, pn_space):
 
   // Process ECN information if present.
   if (ACK frame contains ECN information):
-      ProcessECN(ack)
+      ProcessECN(ack, pn_space)
 
   for acked_packet in newly_acked_packets:
     OnPacketAcked(acked_packet.packet_number, pn_space)
@@ -1338,10 +1338,10 @@ kPersistentCongestionThreshold:
 Variables required to implement the congestion control mechanisms
 are described in this section.
 
-ecn_ce_counter:
-: The highest value reported for the ECN-CE counter by the peer in an ACK
-  frame. This variable is used to detect increases in the reported ECN-CE
-  counter.
+ecn_ce_counters\[kPacketNumberSpace]:
+: The highest value reported for the ECN-CE counter in the packet number space
+  by the peer in an ACK frame. This value is used to detect increases in the
+  reported ECN-CE counter.
 
 bytes_in_flight:
 : The sum of the size in bytes of all sent packets that contain at least one
@@ -1375,7 +1375,8 @@ variables as follows:
    bytes_in_flight = 0
    congestion_recovery_start_time = 0
    ssthresh = infinite
-   ecn_ce_counter = 0
+   for pn_space in [ Initial, Handshake, ApplicationData ]:
+     ecn_ce_counters[pn_space] = 0
 ~~~
 
 
@@ -1442,11 +1443,11 @@ window.
 Invoked when an ACK frame with an ECN section is received from the peer.
 
 ~~~
-   ProcessECN(ack):
+   ProcessECN(ack, pn_space):
      // If the ECN-CE counter reported by the peer has increased,
      // this could be a new congestion event.
-     if (ack.ce_counter > ecn_ce_counter):
-       ecn_ce_counter = ack.ce_counter
+     if (ack.ce_counter > ecn_ce_counters[pn_space]):
+       ecn_ce_counters[pn_space] = ack.ce_counter
        CongestionEvent(sent_packets[ack.largest_acked].time_sent)
 ~~~
 
diff --git a/draft-ietf-quic-transport.md b/draft-ietf-quic-transport.md
index 4dfe929edd..8087ac4f3a 100644
--- a/draft-ietf-quic-transport.md
+++ b/draft-ietf-quic-transport.md
@@ -4586,15 +4586,15 @@ The three ECN Counts are:
 
 ECT(0) Count:
 : A variable-length integer representing the total number of packets received
-  with the ECT(0) codepoint.
+  with the ECT(0) codepoint in the packet number space of the ACK frame.
 
 ECT(1) Count:
 : A variable-length integer representing the total number of packets received
-  with the ECT(1) codepoint.
+  with the ECT(1) codepoint in the packet number space of the ACK frame.
 
 CE Count:
 : A variable-length integer representing the total number of packets received
-  with the CE codepoint.
+  with the CE codepoint in the packet number space of the ACK frame.
 
 ECN counts are maintained separately for each packet number space.