diff --git a/gencapdefs.py b/gencapdefs.py
index f828a38d..4f2d76c6 100644
--- a/gencapdefs.py
+++ b/gencapdefs.py
@@ -15,12 +15,6 @@ from collections import namedtuple
 CapDef = namedtuple("CapDef", ['identifier', 'name', 'url', 'standard'])
 
 CAPDEFS = [
-    CapDef(
-        identifier="LabelTagName",
-        name="draft/label",
-        url="https://ircv3.net/specs/extensions/labeled-response.html",
-        standard="draft IRCv3 tag name",
-    ),
     CapDef(
         identifier="AccountNotify",
         name="account-notify",
@@ -188,11 +182,13 @@ const (
         print(file=output)
     print(")", file=output)
 
+    print("// `capabilityNames[capab]` is the string name of the capability `capab`", file=output)
     print("""var ( capabilityNames = [numCapabs]string{""", file=output)
     for capdef in CAPDEFS:
         print("\"%s\"," % (capdef.name,), file=output)
     print("})", file=output)
 
+    # run the generated code through `gofmt -s`, which will print it to stdout
     gofmt = subprocess.Popen(['gofmt', '-s'], stdin=subprocess.PIPE)
     gofmt.communicate(input=output.getvalue().encode('utf-8'))
     if gofmt.poll() != 0:
diff --git a/irc/caps/constants.go b/irc/caps/constants.go
index d618bd08..84424702 100644
--- a/irc/caps/constants.go
+++ b/irc/caps/constants.go
@@ -51,6 +51,12 @@ const (
 	NegotiatedState State = iota
 )
 
+const (
+	// LabelTagName is the tag name used for the labeled-response spec.
+	// https://ircv3.net/specs/extensions/labeled-response.html
+	LabelTagName = "draft/label"
+)
+
 func init() {
 	nameToCapability = make(map[string]Capability)
 	for capab, name := range capabilityNames {
diff --git a/irc/caps/defs.go b/irc/caps/defs.go
index 7fb5d578..492065c6 100644
--- a/irc/caps/defs.go
+++ b/irc/caps/defs.go
@@ -7,16 +7,12 @@ package caps
 
 const (
 	// number of recognized capabilities:
-	numCapabs = 21
+	numCapabs = 20
 	// length of the uint64 array that represents the bitset:
 	bitsetLen = 1
 )
 
 const (
-	// LabelTagName is the draft IRCv3 tag name capability named "draft/label":
-	// https://ircv3.net/specs/extensions/labeled-response.html
-	LabelTagName Capability = iota
-
 	// AccountNotify is the IRCv3 capability named "account-notify":
 	// https://ircv3.net/specs/extensions/account-notify-3.1.html
 	AccountNotify Capability = iota
@@ -98,9 +94,9 @@ const (
 	UserhostInNames Capability = iota
 )
 
+// `capabilityNames[capab]` is the string name of the capability `capab`
 var (
 	capabilityNames = [numCapabs]string{
-		"draft/label",
 		"account-notify",
 		"account-tag",
 		"away-notify",
diff --git a/irc/responsebuffer.go b/irc/responsebuffer.go
index 7ab697ec..a1071e53 100644
--- a/irc/responsebuffer.go
+++ b/irc/responsebuffer.go
@@ -23,7 +23,7 @@ type ResponseBuffer struct {
 
 // GetLabel returns the label from the given message.
 func GetLabel(msg ircmsg.IrcMessage) string {
-	return msg.Tags[caps.LabelTagName.Name()].Value
+	return msg.Tags[caps.LabelTagName].Value
 }
 
 // NewResponseBuffer returns a new ResponseBuffer.
@@ -90,13 +90,13 @@ func (rb *ResponseBuffer) Send() error {
 	// if label but no batch, add label to first message
 	if useLabel && batch == nil {
 		message := rb.messages[0]
-		message.Tags[caps.LabelTagName.Name()] = ircmsg.MakeTagValue(rb.Label)
+		message.Tags[caps.LabelTagName] = ircmsg.MakeTagValue(rb.Label)
 		rb.messages[0] = message
 	}
 
 	// start batch if required
 	if batch != nil {
-		batch.Start(rb.target, ircmsg.MakeTags(caps.LabelTagName.Name(), rb.Label))
+		batch.Start(rb.target, ircmsg.MakeTags(caps.LabelTagName, rb.Label))
 	}
 
 	// send each message out