diff --git a/internal/tutorial/dslx/chapter02/README.md b/internal/tutorial/dslx/chapter02/README.md
index adac8b742e..8a0c1fa97a 100644
--- a/internal/tutorial/dslx/chapter02/README.md
+++ b/internal/tutorial/dslx/chapter02/README.md
@@ -44,9 +44,9 @@ import (
 	"errors"
 	"net"
 
-	"github.com/ooni/probe-cli/v3/internal/dslx"
 	"github.com/ooni/probe-cli/v3/internal/model"
 	"github.com/ooni/probe-cli/v3/internal/runtimex"
+	"github.com/ooni/probe-cli/v3/internal/x/dslx"
 )
 
 ```
diff --git a/internal/tutorial/dslx/chapter02/main.go b/internal/tutorial/dslx/chapter02/main.go
index 95b398c942..17e9502aa3 100644
--- a/internal/tutorial/dslx/chapter02/main.go
+++ b/internal/tutorial/dslx/chapter02/main.go
@@ -45,9 +45,9 @@ import (
 	"errors"
 	"net"
 
-	"github.com/ooni/probe-cli/v3/internal/dslx"
 	"github.com/ooni/probe-cli/v3/internal/model"
 	"github.com/ooni/probe-cli/v3/internal/runtimex"
+	"github.com/ooni/probe-cli/v3/internal/x/dslx"
 )
 
 // ```
diff --git a/internal/dslx/address.go b/internal/x/dslx/address.go
similarity index 100%
rename from internal/dslx/address.go
rename to internal/x/dslx/address.go
diff --git a/internal/dslx/address_test.go b/internal/x/dslx/address_test.go
similarity index 100%
rename from internal/dslx/address_test.go
rename to internal/x/dslx/address_test.go
diff --git a/internal/dslx/dns.go b/internal/x/dslx/dns.go
similarity index 100%
rename from internal/dslx/dns.go
rename to internal/x/dslx/dns.go
diff --git a/internal/dslx/dns_test.go b/internal/x/dslx/dns_test.go
similarity index 100%
rename from internal/dslx/dns_test.go
rename to internal/x/dslx/dns_test.go
diff --git a/internal/dslx/doc.go b/internal/x/dslx/doc.go
similarity index 100%
rename from internal/dslx/doc.go
rename to internal/x/dslx/doc.go
diff --git a/internal/dslx/endpoint.go b/internal/x/dslx/endpoint.go
similarity index 100%
rename from internal/dslx/endpoint.go
rename to internal/x/dslx/endpoint.go
diff --git a/internal/dslx/endpoint_test.go b/internal/x/dslx/endpoint_test.go
similarity index 100%
rename from internal/dslx/endpoint_test.go
rename to internal/x/dslx/endpoint_test.go
diff --git a/internal/dslx/fxasync.go b/internal/x/dslx/fxasync.go
similarity index 100%
rename from internal/dslx/fxasync.go
rename to internal/x/dslx/fxasync.go
diff --git a/internal/dslx/fxasync_test.go b/internal/x/dslx/fxasync_test.go
similarity index 100%
rename from internal/dslx/fxasync_test.go
rename to internal/x/dslx/fxasync_test.go
diff --git a/internal/dslx/fxcore.go b/internal/x/dslx/fxcore.go
similarity index 100%
rename from internal/dslx/fxcore.go
rename to internal/x/dslx/fxcore.go
diff --git a/internal/dslx/fxcore_test.go b/internal/x/dslx/fxcore_test.go
similarity index 100%
rename from internal/dslx/fxcore_test.go
rename to internal/x/dslx/fxcore_test.go
diff --git a/internal/dslx/fxgen.go b/internal/x/dslx/fxgen.go
similarity index 100%
rename from internal/dslx/fxgen.go
rename to internal/x/dslx/fxgen.go
diff --git a/internal/dslx/fxstream.go b/internal/x/dslx/fxstream.go
similarity index 100%
rename from internal/dslx/fxstream.go
rename to internal/x/dslx/fxstream.go
diff --git a/internal/dslx/fxstream_test.go b/internal/x/dslx/fxstream_test.go
similarity index 100%
rename from internal/dslx/fxstream_test.go
rename to internal/x/dslx/fxstream_test.go
diff --git a/internal/dslx/http_test.go b/internal/x/dslx/http_test.go
similarity index 100%
rename from internal/dslx/http_test.go
rename to internal/x/dslx/http_test.go
diff --git a/internal/dslx/httpcore.go b/internal/x/dslx/httpcore.go
similarity index 100%
rename from internal/dslx/httpcore.go
rename to internal/x/dslx/httpcore.go
diff --git a/internal/dslx/httpquic.go b/internal/x/dslx/httpquic.go
similarity index 100%
rename from internal/dslx/httpquic.go
rename to internal/x/dslx/httpquic.go
diff --git a/internal/dslx/httptcp.go b/internal/x/dslx/httptcp.go
similarity index 100%
rename from internal/dslx/httptcp.go
rename to internal/x/dslx/httptcp.go
diff --git a/internal/dslx/httptls.go b/internal/x/dslx/httptls.go
similarity index 100%
rename from internal/dslx/httptls.go
rename to internal/x/dslx/httptls.go
diff --git a/internal/dslx/integration_test.go b/internal/x/dslx/integration_test.go
similarity index 100%
rename from internal/dslx/integration_test.go
rename to internal/x/dslx/integration_test.go
diff --git a/internal/dslx/observations.go b/internal/x/dslx/observations.go
similarity index 100%
rename from internal/dslx/observations.go
rename to internal/x/dslx/observations.go
diff --git a/internal/dslx/qa_test.go b/internal/x/dslx/qa_test.go
similarity index 100%
rename from internal/dslx/qa_test.go
rename to internal/x/dslx/qa_test.go
diff --git a/internal/dslx/quic.go b/internal/x/dslx/quic.go
similarity index 100%
rename from internal/dslx/quic.go
rename to internal/x/dslx/quic.go
diff --git a/internal/dslx/quic_test.go b/internal/x/dslx/quic_test.go
similarity index 100%
rename from internal/dslx/quic_test.go
rename to internal/x/dslx/quic_test.go
diff --git a/internal/dslx/runtimecore.go b/internal/x/dslx/runtimecore.go
similarity index 100%
rename from internal/dslx/runtimecore.go
rename to internal/x/dslx/runtimecore.go
diff --git a/internal/dslx/runtimemeasurex.go b/internal/x/dslx/runtimemeasurex.go
similarity index 100%
rename from internal/dslx/runtimemeasurex.go
rename to internal/x/dslx/runtimemeasurex.go
diff --git a/internal/dslx/runtimemeasurex_test.go b/internal/x/dslx/runtimemeasurex_test.go
similarity index 100%
rename from internal/dslx/runtimemeasurex_test.go
rename to internal/x/dslx/runtimemeasurex_test.go
diff --git a/internal/dslx/runtimeminimal.go b/internal/x/dslx/runtimeminimal.go
similarity index 100%
rename from internal/dslx/runtimeminimal.go
rename to internal/x/dslx/runtimeminimal.go
diff --git a/internal/dslx/runtimeminimal_test.go b/internal/x/dslx/runtimeminimal_test.go
similarity index 100%
rename from internal/dslx/runtimeminimal_test.go
rename to internal/x/dslx/runtimeminimal_test.go
diff --git a/internal/dslx/tcp.go b/internal/x/dslx/tcp.go
similarity index 100%
rename from internal/dslx/tcp.go
rename to internal/x/dslx/tcp.go
diff --git a/internal/dslx/tcp_test.go b/internal/x/dslx/tcp_test.go
similarity index 100%
rename from internal/dslx/tcp_test.go
rename to internal/x/dslx/tcp_test.go
diff --git a/internal/dslx/tls.go b/internal/x/dslx/tls.go
similarity index 100%
rename from internal/dslx/tls.go
rename to internal/x/dslx/tls.go
diff --git a/internal/dslx/tls_test.go b/internal/x/dslx/tls_test.go
similarity index 100%
rename from internal/dslx/tls_test.go
rename to internal/x/dslx/tls_test.go
diff --git a/internal/dslx/trace.go b/internal/x/dslx/trace.go
similarity index 100%
rename from internal/dslx/trace.go
rename to internal/x/dslx/trace.go