diff --git a/src/cmd/go/internal/modfetch/coderepo.go b/src/cmd/go/internal/modfetch/coderepo.go
index dfef9f73c2..df835c3d7e 100644
--- a/src/cmd/go/internal/modfetch/coderepo.go
+++ b/src/cmd/go/internal/modfetch/coderepo.go
@@ -567,11 +567,11 @@ func (r *codeRepo) validatePseudoVersion(info *codehost.RevInfo, version string)
 	if rev != info.Short {
 		switch {
 		case strings.HasPrefix(rev, info.Short):
-			return fmt.Errorf("revision is longer than canonical (%s)", info.Short)
+			return fmt.Errorf("revision is longer than canonical (expected %s)", info.Short)
 		case strings.HasPrefix(info.Short, rev):
-			return fmt.Errorf("revision is shorter than canonical (%s)", info.Short)
+			return fmt.Errorf("revision is shorter than canonical (expected %s)", info.Short)
 		default:
-			return fmt.Errorf("does not match short name of revision (%s)", info.Short)
+			return fmt.Errorf("does not match short name of revision (expected %s)", info.Short)
 		}
 	}
 
diff --git a/src/cmd/go/testdata/script/mod_invalid_version.txt b/src/cmd/go/testdata/script/mod_invalid_version.txt
index f9317b676d..428b8aa60e 100644
--- a/src/cmd/go/testdata/script/mod_invalid_version.txt
+++ b/src/cmd/go/testdata/script/mod_invalid_version.txt
@@ -57,20 +57,20 @@ cp go.mod.orig go.mod
 go mod edit -require golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0
 cd outside
 ! go list -m golang.org/x/text
-stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0: invalid pseudo-version: revision is shorter than canonical \(14c0d48ead0c\)'
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0: invalid pseudo-version: revision is shorter than canonical \(expected 14c0d48ead0c\)'
 cd ..
 ! go list -m golang.org/x/text
-stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0: invalid pseudo-version: revision is shorter than canonical \(14c0d48ead0c\)'
+stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0: invalid pseudo-version: revision is shorter than canonical \(expected 14c0d48ead0c\)'
 
 # A pseudo-version with more than 12 digits of SHA-1 prefix is invalid.
 cp go.mod.orig go.mod
 go mod edit -require golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a
 cd outside
 ! go list -m golang.org/x/text
-stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a: invalid pseudo-version: revision is longer than canonical \(14c0d48ead0c\)'
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a: invalid pseudo-version: revision is longer than canonical \(expected 14c0d48ead0c\)'
 cd ..
 ! go list -m golang.org/x/text
-stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a: invalid pseudo-version: revision is longer than canonical \(14c0d48ead0c\)'
+stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a: invalid pseudo-version: revision is longer than canonical \(expected 14c0d48ead0c\)'
 
 # A pseudo-version that does not match the commit timestamp is invalid.
 cp go.mod.orig go.mod