diff --git a/sydent/config/email.py b/sydent/config/email.py
index 0b86a83f..b3567132 100644
--- a/sydent/config/email.py
+++ b/sydent/config/email.py
@@ -35,6 +35,8 @@ def parse_config(self, cfg: CONFIG_PARSER_DICT) -> bool:
         # This isn't used anywhere...
         self.validation_subject = config.get("email.subject")
 
+        # Interpolation is turned off for these two options
+        # This allows them to use %(variable)s substitution without raising errors
         self.invite_subject = config.get("email.invite.subject")
         self.invite_subject_space = config.get("email.invite.subject_space")