diff --git a/config/example-extras.cfg b/config/example-extras.cfg
index 61a3d276..459a61aa 100644
--- a/config/example-extras.cfg
+++ b/config/example-extras.cfg
@@ -33,12 +33,14 @@
 #activate_gcode:
 #   A list of G-Code commands (one per line; subsequent lines
 #   indented) to execute prior to each probe attempt. This may be
-#   useful if the probe needs to be activated in some way. The default
-#   is to not run any special G-Code commands on activation.
+#   useful if the probe needs to be activated in some way. Do not
+#   issue any commands here that move the toolhead (eg, G1). The
+#   default is to not run any special G-Code commands on activation.
 #deactivate_gcode:
 #   A list of G-Code commands (one per line; subsequent lines
-#   indented) to execute after each probe attempt completes. The
-#   default is to not run any special G-Code commands on deactivation.
+#   indented) to execute after each probe attempt completes. Do not
+#   issue any commands here that move the toolhead. The default is to
+#   not run any special G-Code commands on deactivation.
 
 
 # Bed tilt compensation. One may define a [bed_tilt] config section to