diff --git a/docs/manpage/front-end-cal-manpage b/docs/manpage/front-end-cal-manpage
index a12660611..e1fed60c8 100644
--- a/docs/manpage/front-end-cal-manpage
+++ b/docs/manpage/front-end-cal-manpage
@@ -28,7 +28,7 @@ The crystal oscillator that ships with the RTL2832U family devices exhibits limi
 .SH SEE ALSO
 .BR gnss-sdr (1), volk_gnsssdr_profile (1)
 \.TP
-Example of configuration file available at: ${prefix}/share/gnss-sdr/conf/front-end-cal.conf, where ${prefix}$ uses to be /usr or /usr/local.
+Example of configuration file available at: ${prefix}/share/gnss-sdr/conf/front-end-cal.conf, where ${prefix}$ uses to be /usr or /usr/local. This will be the configuration file used by default if the \fB-config_file\fR option is not set.
 \.TP
 [1] C. Fernandez-Prades, J. Arribas, P. Closas, \fITurning a Television into a GNSS Receiver\fR, in Proceedings of ION GNSS+, 15-16 September 2013, Nashville, Tennessee (USA). A draft copy is freely available at http://www.cttc.es/publication/turning-a-television-into-a-gnss-receiver/
 \.TP