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-rw-r--r--synapse/config/emailconfig.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/config/emailconfig.py b/synapse/config/emailconfig.py
index 43fad0bf8b..ac1724045f 100644
--- a/synapse/config/emailconfig.py
+++ b/synapse/config/emailconfig.py
@@ -146,6 +146,8 @@ class EmailConfig(Config):
                 if k not in email_config:
                     missing.append("email." + k)
 
+            # public_baseurl is required to build password reset and validation links that
+            # will be emailed to users
             if config.get("public_baseurl") is None:
                 missing.append("public_baseurl")