Add a note about when the configuration is saved

htop.1.in

@@ -602,7 +602,7 @@ By default
 .B htop
 reads its configuration from the XDG-compliant path
 .IR ~/.config/htop/htoprc .
-The configuration file is overwritten by
+The configuration file is overwritten upon clean exit by
 .BR htop 's
 in-program Setup configuration, so it should not be hand-edited.
 If no user configuration exists
@@ -644,6 +644,13 @@ can also be displayed by
 if the
 .BR pmdaopenmetrics (1)
 component is configured.
+.LP
+The configuration for both
+.B htop
+and
+.B pcp-htop
+is only saved when a clean exit is performed. Sending any signal will cause
+.I all configuration changes to be lost.
 .SH "MEMORY SIZES"
 Memory sizes in
 .B htop