diff --git a/protoc.go b/protoc.go
index 01012cb..b37e50e 100644
--- a/protoc.go
+++ b/protoc.go
@@ -33,7 +33,8 @@ This returns (UUID, Version, error on failure)
 func ValidProtobuf(filename string) (string, string, error) {
 	filebase := strings.TrimSuffix(filename, ".proto")
 	base := cases.Title(language.English, cases.NoLower).String(filebase)
-	pluralBase := base + "s" // to conform to autogenpb, it must have an added 's'
+	pluralBase := base + "s"   // to conform to autogenpb, it must have an added 's'
+	pluralBase2 := base + "es" // english is annoying, so allow this too
 
 	file, err := os.Open(filename)
 	if err != nil {
@@ -46,9 +47,12 @@ func ValidProtobuf(filename string) (string, string, error) {
 
 		prefix := "message " + pluralBase + " {"
 		if !strings.HasPrefix(line, prefix) {
-			// log.Info("nope", prefix, "line", line)
-			// nope, not this line
-			continue
+			prefix = "message " + pluralBase2 + " {"
+			if !strings.HasPrefix(line, prefix) {
+				// log.Info("nope", prefix, "line", line)
+				// nope, not this line
+				continue
+			}
 		}
 
 		scanner.Scan()