diff --git a/go/overlay/doc.go b/go/overlay/doc.go
new file mode 100644
index 0000000..8a9f1b7
--- /dev/null
+++ b/go/overlay/doc.go
@@ -0,0 +1,5 @@
+// Package overlay is the private network's generator, copied from mesh-controller internal/overlay at commit
+// 6c2a8d62100cb7d491f8eb9a623e1eeea5ec0de1 (novox/hq ADR 0453 clause 3, ADR 0446 clause 4): the files are unchanged but
+// for the import path of the catalogue, which is mesh-sdk's go/catalogue, and this note. mesh-controller keeps its own copy
+// until release 4b.
+package overlay
diff --git a/go/overlay/generator.go b/go/overlay/generator.go
index 6c829f0..d74087d 100644
--- a/go/overlay/generator.go
+++ b/go/overlay/generator.go
@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"strconv"
 
-	"github.com/novox/mesh-controller/internal/catalogue"
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
 )
 
 // The private network as a module rather than as code beside the module system.
diff --git a/go/overlay/opens_test.go b/go/overlay/opens_test.go
index 06f4c93..7abf1bd 100644
--- a/go/overlay/opens_test.go
+++ b/go/overlay/opens_test.go
@@ -4,7 +4,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/novox/mesh-controller/internal/catalogue"
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
 )
 
 func networkOf(t *testing.T, nodes []Node) *Generator {
diff --git a/go/overlay/seat_test.go b/go/overlay/seat_test.go
index 33512e7..d005546 100644
--- a/go/overlay/seat_test.go
+++ b/go/overlay/seat_test.go
@@ -4,7 +4,7 @@ import (
 	"encoding/json"
 	"testing"
 
-	"github.com/novox/mesh-controller/internal/catalogue"
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
 )
 
 // The private network's claim is a seat the mesh defines (novox/hq ADR 0110).