diff --git a/.travis.yml b/.travis.yml
index 1acd8eb3..5f49d130 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: go
-go_import_path: github.com/rogpeppe/modinternal
+go_import_path: github.com/rogpeppe/go-internal
 go: 
   - "1.11"
 script: go test ./...
diff --git a/README.md b/README.md
index 23fd9458..2a7c7f3d 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,16 @@
-This repository factors out some internal packages from the cmd/go internal package
-in the Go standard library.
+This repository factors out an opinionated selection of internal packages and functionality from the Go standard
+library. Currently this consists mostly of packages and testing code from within the Go tool implementation.
 
-It also factors out into a separate package the script-based testing functionality
-(http://godoc.org/github.com/rogpeppe/modinternal/testscript) and the Go proxy test server (http://godoc.org/github.com/rogpeppe/modinternal/goproxytest).
+Included are the following:
+
+- dirhash: calculate hashes over directory trees the same way that the Go tool does.
+- goproxytest: a GOPROXY implementation designed for test use.
+- gotooltest: Use the Go tool inside test scripts (see testscript below)
+- imports: list of known architectures and OSs, and support for reading import import statements.
+- modfile: read and write `go.mod` files while preserving formatting and comments.
+- module: module paths and versions.
+- par: do work in parallel.
+- semver: semantic version parsing.
+- testenv: information on the current testing environment.
+- testscript: script-based testing based on txtar files
+- txtar: simple text-based file archives for testing.
diff --git a/cmd/txtar-addmod/addmod.go b/cmd/txtar-addmod/addmod.go
index 22f9907e..aada9b7f 100644
--- a/cmd/txtar-addmod/addmod.go
+++ b/cmd/txtar-addmod/addmod.go
@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // The txtar-addmod command adds a module as a txtar archive to the a testdata module directory
-// as understood by the goproxytest package (see https://godoc.org/github.com/rogpeppe/modinternal/goproxytest).
+// as understood by the goproxytest package (see https://godoc.org/github.com/rogpeppe/go-internal/goproxytest).
 //
 // Usage:
 //
@@ -29,7 +29,7 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/rogpeppe/modinternal/txtar"
+	"github.com/rogpeppe/go-internal/txtar"
 )
 
 func usage() {
diff --git a/cmd/txtar-goproxy/main.go b/cmd/txtar-goproxy/main.go
index 3e9dba86..81900386 100644
--- a/cmd/txtar-goproxy/main.go
+++ b/cmd/txtar-goproxy/main.go
@@ -21,7 +21,7 @@ import (
 	"log"
 	"os"
 
-	"github.com/rogpeppe/modinternal/goproxytest"
+	"github.com/rogpeppe/go-internal/goproxytest"
 )
 
 var proxyAddr = flag.String("addr", "", "run proxy on this network address instead of running any tests")
diff --git a/cmd/txtar-savedir/savedir.go b/cmd/txtar-savedir/savedir.go
index 7bba2f6b..1faf3ed4 100644
--- a/cmd/txtar-savedir/savedir.go
+++ b/cmd/txtar-savedir/savedir.go
@@ -8,7 +8,7 @@
 //
 //	txtar-savedir /path/to/dir >saved.txt
 //
-// See https://godoc.org/github.com/rogpeppe/modinternal/txtar for details of the format
+// See https://godoc.org/github.com/rogpeppe/go-internal/txtar for details of the format
 // and how to parse a txtar file.
 //
 package main
@@ -23,7 +23,7 @@ import (
 	"strings"
 	"unicode/utf8"
 
-	"github.com/rogpeppe/modinternal/txtar"
+	"github.com/rogpeppe/go-internal/txtar"
 )
 
 func usage() {
diff --git a/go.mod b/go.mod
index 9a5a96f4..9c350f74 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
-module github.com/rogpeppe/modinternal
+module github.com/rogpeppe/go-internal
 
 require gopkg.in/errgo.v2 v2.1.0
diff --git a/goproxytest/proxy.go b/goproxytest/proxy.go
index 2ec221f6..4db6d08b 100644
--- a/goproxytest/proxy.go
+++ b/goproxytest/proxy.go
@@ -37,10 +37,10 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/rogpeppe/modinternal/module"
-	"github.com/rogpeppe/modinternal/par"
-	"github.com/rogpeppe/modinternal/semver"
-	"github.com/rogpeppe/modinternal/txtar"
+	"github.com/rogpeppe/go-internal/module"
+	"github.com/rogpeppe/go-internal/par"
+	"github.com/rogpeppe/go-internal/semver"
+	"github.com/rogpeppe/go-internal/txtar"
 )
 
 var (
diff --git a/goproxytest/pseudo.go b/goproxytest/pseudo.go
index fea4fed0..570acaae 100644
--- a/goproxytest/pseudo.go
+++ b/goproxytest/pseudo.go
@@ -8,7 +8,7 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/rogpeppe/modinternal/semver"
+	"github.com/rogpeppe/go-internal/semver"
 )
 
 // This code was taken from cmd/go/internal/modfetch/pseudo.go
diff --git a/gotooltest/setup.go b/gotooltest/setup.go
index 43b6b30d..cb83a7a8 100644
--- a/gotooltest/setup.go
+++ b/gotooltest/setup.go
@@ -13,8 +13,8 @@ import (
 	"runtime"
 	"strings"
 
-	"github.com/rogpeppe/modinternal/imports"
-	"github.com/rogpeppe/modinternal/testscript"
+	"github.com/rogpeppe/go-internal/imports"
+	"github.com/rogpeppe/go-internal/testscript"
 )
 
 type testContext struct {
diff --git a/imports/scan_test.go b/imports/scan_test.go
index 999a628d..253bce1a 100644
--- a/imports/scan_test.go
+++ b/imports/scan_test.go
@@ -10,7 +10,7 @@ import (
 	"runtime"
 	"testing"
 
-	"github.com/rogpeppe/modinternal/testenv"
+	"github.com/rogpeppe/go-internal/testenv"
 )
 
 func TestScan(t *testing.T) {
diff --git a/modfile/rule.go b/modfile/rule.go
index 66e5292b..24d275f1 100644
--- a/modfile/rule.go
+++ b/modfile/rule.go
@@ -15,8 +15,8 @@ import (
 	"strings"
 	"unicode"
 
-	"github.com/rogpeppe/modinternal/module"
-	"github.com/rogpeppe/modinternal/semver"
+	"github.com/rogpeppe/go-internal/module"
+	"github.com/rogpeppe/go-internal/semver"
 )
 
 // A File is the parsed, interpreted form of a go.mod file.
diff --git a/module/module.go b/module/module.go
index 6293d0ab..3ff6d9bf 100644
--- a/module/module.go
+++ b/module/module.go
@@ -24,7 +24,7 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/rogpeppe/modinternal/semver"
+	"github.com/rogpeppe/go-internal/semver"
 )
 
 // A Version is defined by a module path and version pair.
diff --git a/testscript/cmd.go b/testscript/cmd.go
index 4484766a..76057109 100644
--- a/testscript/cmd.go
+++ b/testscript/cmd.go
@@ -184,7 +184,7 @@ func (ts *TestScript) cmdExec(neg bool, args []string) {
 	if err != nil {
 		ts.Logf("[%v]\n", err)
 		if !neg {
-			ts.Fatalf("unexpected command failure")
+			ts.Fatalf("unexpected command failure (neg %v; args %q)", neg, args)
 		}
 	} else {
 		if neg {
@@ -335,7 +335,7 @@ func scriptMatch(ts *TestScript, neg bool, args []string, text, name string) {
 		want = 2
 	}
 	if len(args) != want {
-		ts.Fatalf("usage: %s [-count=N] 'pattern' file%s", name, extraUsage)
+		ts.Fatalf("usage: %s [-count=N] 'pattern'%s", name, extraUsage)
 	}
 
 	pattern := args[0]
diff --git a/testscript/doc.go b/testscript/doc.go
index 59e67297..c1a35f8f 100644
--- a/testscript/doc.go
+++ b/testscript/doc.go
@@ -38,7 +38,7 @@ In general script files should have short names: a few words, not whole sentence
 The first word should be the general category of behavior being tested,
 often the name of a subcommand to be tested or a concept (vendor, pattern).
 
-Each script is a text archive (go doc github.com/rogpeppe/modinternal/txtar).
+Each script is a text archive (go doc github.com/rogpeppe/go-internal/txtar).
 The script begins with an actual command script to run
 followed by the content of zero or more supporting files to
 create in the script's temporary file system before it starts executing.
diff --git a/testscript/testscript.go b/testscript/testscript.go
index 7781eb3b..21c069e7 100644
--- a/testscript/testscript.go
+++ b/testscript/testscript.go
@@ -21,9 +21,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/rogpeppe/modinternal/par"
-	"github.com/rogpeppe/modinternal/testenv"
-	"github.com/rogpeppe/modinternal/txtar"
+	"github.com/rogpeppe/go-internal/par"
+	"github.com/rogpeppe/go-internal/testenv"
+	"github.com/rogpeppe/go-internal/txtar"
 )
 
 var execCache par.Cache