Update listening_ports documentation

diff --git a/docs/UserManual.md b/docs/UserManual.md
index 7289cfa085cf5ff575568d51e4c8c356dbe16896..f036b230027ebec974c8a191e9b54a92bcd4e6f7 100644 (file)
--- a/docs/UserManual.md
+++ b/docs/UserManual.md
@@ -442,7 +442,7 @@ Comma-separated list of ports to listen on. If the port is SSL, a
 letter `s` must be appended, for example, `80,443s` will open
 port 80 and port 443, and connections on port 443 will be SSL-ed. If the port
 should be optional the letter `o` must be appended, for example with `80o,443s`
-starting the server will not exit if binding to port 80 is not possible.
+the server will not exit if binding to port 80 is not possible during startup.
 For non-SSL ports, it is allowed to append letter `r`, meaning 'redirect'.
 Redirect ports will redirect all their traffic to the first configured
 SSL port. For example, if `listening_ports` is `80r,443s`, then all