diff --git a/dtool/src/interrogate/interrogate.cxx b/dtool/src/interrogate/interrogate.cxx
index 15abba6ac2..7e7e6e8280 100644
--- a/dtool/src/interrogate/interrogate.cxx
+++ b/dtool/src/interrogate/interrogate.cxx
@@ -550,7 +550,7 @@ main(int argc, char **argv) {
 
     output_include
       << "/*\n"
-      << " * This file generated by:\n"
+      << " * This file was generated by:\n"
       << " * " << command_line << "\n"
       << " *\n"
       << " */\n\n";
@@ -572,7 +572,7 @@ main(int argc, char **argv) {
 
     output_code
       << "/*\n"
-      << " * This file generated by:\n"
+      << " * This file was generated by:\n"
       << " * " << command_line << "\n"
       << " *\n"
       << " */\n\n";