diff --git a/irc/client_lookup_set.go b/irc/client_lookup_set.go
index b83990bf..95314509 100644
--- a/irc/client_lookup_set.go
+++ b/irc/client_lookup_set.go
@@ -432,12 +432,6 @@ func (set *UserMaskSet) Length() int {
 	return len(set.masks)
 }
 
-// setRegexp generates a regular expression from the set of user mask
-// strings. Masks are split at the two types of wildcards, `*` and
-// `?`. All the pieces are meta-escaped. `*` is replaced with `.*`,
-// the regexp equivalent. Likewise, `?` is replaced with `.`. The
-// parts are re-joined and finally all masks are joined into a big
-// or-expression.
 func (set *UserMaskSet) setRegexp() {
 	set.RLock()
 	maskExprs := make([]string, len(set.masks))
diff --git a/irc/utils/glob.go b/irc/utils/glob.go
index 891358b3..04ee6116 100644
--- a/irc/utils/glob.go
+++ b/irc/utils/glob.go
@@ -46,6 +46,9 @@ func CompileGlob(glob string, submatch bool) (result *regexp.Regexp, err error)
 	return regexp.Compile(buf.String())
 }
 
+// Compile a list of globs into a single or-expression that matches any one of them.
+// This is used for channel ban/invite/exception lists. It's applicable to k-lines
+// but we're not using it there yet.
 func CompileMasks(masks []string) (result *regexp.Regexp, err error) {
 	var buf bytes.Buffer
 	buf.WriteString("^(")