diff --git a/main.go b/main.go
index e78609b..f04ce87 100644
--- a/main.go
+++ b/main.go
@@ -51,7 +51,7 @@ func (md *markdown) Generate(plugin *protogen.Plugin) error {
 	// All other files are imported by the service proto.
 	for _, f := range plugin.Files {
 		if len(f.Services) == 0 {
-			return nil
+			continue
 		}
 
 		fname := f.GeneratedFilenamePrefix + ".md"