diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 21a44ea..bcde178 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -110,6 +110,7 @@
     return compiler_backend_;
   }
 
+  // Are we compiling and creating an image file?
   bool IsImage() const {
     return image_;
   }