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-rw-r--r--synapse/config/tls.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/config/tls.py b/synapse/config/tls.py
index 40045de7ac..f0014902da 100644
--- a/synapse/config/tls.py
+++ b/synapse/config/tls.py
@@ -181,6 +181,11 @@ class TlsConfig(Config):
         # See 'ACME support' below to enable auto-provisioning this certificate via
         # Let's Encrypt.
         #
+        # If supplying your own, be sure to use a `.pem` file that includes the
+        # full certificate chain including any intermediate certificates (for
+        # instance, if using certbot, use `fullchain.pem` as your certificate,
+        # not `cert.pem`).
+        #
         #tls_certificate_path: "%(tls_certificate_path)s"
 
         # PEM-encoded private key for TLS