diff --git a/spec/core/ics-004-channel-and-packet-semantics/README.md b/spec/core/ics-004-channel-and-packet-semantics/README.md
index eb8686efe..b3fa8340c 100644
--- a/spec/core/ics-004-channel-and-packet-semantics/README.md
+++ b/spec/core/ics-004-channel-and-packet-semantics/README.md
@@ -322,8 +322,7 @@ function chanOpenInit(
   order: ChannelOrder,
   connectionHops: [Identifier],
   portIdentifier: Identifier,
-  counterpartyPortIdentifier: Identifier,
-  version: string): (channelIdentifier: Identifier, channelCapability: CapabilityKey) {
+  counterpartyPortIdentifier: Identifier): (channelIdentifier: Identifier, channelCapability: CapabilityKey) {
     channelIdentifier = generateIdentifier()
     abortTransactionUnless(validateChannelIdentifier(portIdentifier, channelIdentifier))
 
@@ -354,7 +353,6 @@ function chanOpenTry(
   portIdentifier: Identifier,
   counterpartyPortIdentifier: Identifier,
   counterpartyChannelIdentifier: Identifier,
-  version: string,
   counterpartyVersion: string,
   proofInit: CommitmentProof,
   proofHeight: Height): (channelIdentifier: Identifier, channelCapability: CapabilityKey) {
diff --git a/spec/core/ics-026-routing-module/README.md b/spec/core/ics-026-routing-module/README.md
index c457e3526..6c926f0ad 100644
--- a/spec/core/ics-026-routing-module/README.md
+++ b/spec/core/ics-026-routing-module/README.md
@@ -418,9 +418,7 @@ interface ChanOpenInit {
   order: ChannelOrder
   connectionHops: [Identifier]
   portIdentifier: Identifier
-  channelIdentifier: Identifier
   counterpartyPortIdentifier: Identifier
-  counterpartyChannelIdentifier: Identifier
   version: string
 }
 ```
@@ -432,18 +430,14 @@ function handleChanOpenInit(datagram: ChanOpenInit) {
     datagram.order,
     datagram.connectionHops,
     datagram.portIdentifier,
-    datagram.channelIdentifier,
-    datagram.counterpartyPortIdentifier,
-    datagram.counterpartyChannelIdentifier,
-    version // pass in version returned from callback
+    datagram.counterpartyPortIdentifier
   )
   version, err = module.onChanOpenInit(
     datagram.order,
     datagram.connectionHops,
     datagram.portIdentifier,
-    datagram.channelIdentifier,
+    channelIdentifier,
     datagram.counterpartyPortIdentifier,
-    datagram.counterpartyChannelIdentifier,
     datagram.version
   )
   abortTransactionUnless(err === nil)
@@ -468,7 +462,6 @@ interface ChanOpenTry {
   channelIdentifier: Identifier
   counterpartyPortIdentifier: Identifier
   counterpartyChannelIdentifier: Identifier
-  version: string
   counterpartyVersion: string
   proofInit: CommitmentProof
   proofHeight: Height
@@ -485,7 +478,6 @@ function handleChanOpenTry(datagram: ChanOpenTry) {
     datagram.channelIdentifier,
     datagram.counterpartyPortIdentifier,
     datagram.counterpartyChannelIdentifier,
-    version, // pass in version returned by callback
     datagram.counterpartyVersion,
     datagram.proofInit,
     datagram.proofHeight
@@ -494,7 +486,7 @@ function handleChanOpenTry(datagram: ChanOpenTry) {
     datagram.order,
     datagram.connectionHops,
     datagram.portIdentifier,
-    datagram.channelIdentifier,
+    channelIdentifier,
     datagram.counterpartyPortIdentifier,
     datagram.counterpartyChannelIdentifier,
     datagram.counterpartyVersion