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diff --git a/info/blueshift.texinfo b/info/blueshift.texinfo
index 53d18a6..423c24f 100644
--- a/info/blueshift.texinfo
+++ b/info/blueshift.texinfo
@@ -54,6 +54,7 @@ Texts. A copy of the license is included in the section entitled
 * Invoking::                        Invocation of @command{blueshift}.
 * Signals::                         Signals handled by @command{blueshift}.
 * Configuration API::               How to write configuration files.
+* Terminology::                     Related terminology
 * GNU Free Documentation License::  Copying and sharing this manual.
 @end menu
 
@@ -860,6 +861,57 @@ as specified.
 
 
 
+@node Terminology
+@chapter Terminology
+
+Terminology related to Blueshift:
+
+@table @asis
+@item Ad-hoc mode
+@itemx One time mode
+Running Blueshift without a configuration script.
+
+@item Configuration mode
+Running Blueshift with a configuration script.
+
+@item Configuration script
+Blueshift provides a mechanism for adjusting
+colours on the monitors. Configuration scripts,
+invoked by Blueshift, implements the policy
+for doing so.
+
+@item Continuous mode
+Running Blueshift such at it applies adjustments
+but than continues to run and applies now
+(time dependent) adjustments every now and then
+until the user terminates Blueshift.
+
+@item One shot mode
+Running Blueshift such at it applies adjustments
+and than exits.
+
+ @item Panicgate
+Applying adjustments immediately without
+transitioning. This terminology is borrowed
+from OpenNTPD.
+
+@item High day
+@itemx Day
+@itemx Daytime
+The time during the day when the Sun elevated to
+be 100 % visible. The time between sunrise and
+sunset; when it is full daylight.
+
+@item High night
+@itemx Night
+@itemx Nighttime
+The time during the day when the Sun elevated to
+be 0 % visible. The time between dusk and dawn;
+when it is complete darkness.
+@end table
+
+
+
 @node GNU Free Documentation License
 @appendix GNU Free Documentation License
 @include fdl.texinfo