X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/fd98a5c6771f3a5a686e54370b0525dcc3dca2f9..0fbd9bff:/doc/doc-docbook/spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 9c03523bb..92d0a2287 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -16066,6 +16066,9 @@ use OpenSSL with a directory.
 
 See &<<SECTtlssni>>& for discussion of when this option might be re-expanded.
 
+A forced expansion failure or setting to an empty string is equivalent to
+being unset.
+
 
 .option tls_verify_hosts main "host list&!!" unset
 .cindex "TLS" "client certificate verification"