diff --git a/git-codereview/change.go b/git-codereview/change.go
index ec6e1b6..f7b8ec1 100644
--- a/git-codereview/change.go
+++ b/git-codereview/change.go
@@ -143,7 +143,7 @@
 }
 
 var (
-	messageRE  = regexp.MustCompile(`^(\[[a-zA-Z0-9.-]+\] )?[a-zA-Z0-9-/, ]+: `)
+	messageRE  = regexp.MustCompile(`^(\[[a-zA-Z0-9.-]+\] )?[a-zA-Z0-9-/,. ]+: `)
 	oldFixesRE = regexp.MustCompile(`Fixes +(issue +#?)?([0-9]+)`)
 )
 
diff --git a/git-codereview/change_test.go b/git-codereview/change_test.go
index d055287..4a24c6a 100644
--- a/git-codereview/change_test.go
+++ b/git-codereview/change_test.go
@@ -47,6 +47,7 @@
 		{"math: fix cosine", true},
 		{"math/rand: make randomer", true},
 		{"math/rand, crypto/rand: fix random sources", true},
+		{"cmd/internal/rsc.io/x86: update from external repo", true},
 	} {
 		got := messageRE.MatchString(c.in)
 		if got != c.want {