diff --git a/rust2rpm/generator.py b/rust2rpm/generator.py
index 4d77196..11f3c5e 100644
--- a/rust2rpm/generator.py
+++ b/rust2rpm/generator.py
@@ -187,7 +187,7 @@ def spec_render_crate(
     else:
         log.warn("No license information in crate metadata.")
         rpm_license = None
-        rpm_license_comments = "FIXME: No license information in crate metadata."
+        rpm_license_comments = "# FIXME: No license information in crate metadata."
 
     template_args_common = {
         # Parameters specific to rust2rpm