diff --git a/src/lang/english_AU.txt b/src/lang/english_AU.txt
--- a/src/lang/english_AU.txt
+++ b/src/lang/english_AU.txt
@@ -4592,6 +4592,7 @@ STR_AI_CONFIG_RANDOM_AI                 
 STR_AI_CONFIG_NONE                                              :(none)
 STR_AI_CONFIG_NAME_VERSION                                      :{STRING} {YELLOW}v{NUM}
 STR_AI_CONFIG_MAX_COMPETITORS                                   :{LTBLUE}Maximum no. competitors: {ORANGE}{COMMA}
+STR_AI_CONFIG_COMPETITORS_INTERVAL                              :{LTBLUE}Interval between starting of competitors: {ORANGE}{COMMA} minute{P "" s}
 
 STR_AI_CONFIG_MOVE_UP                                           :{BLACK}Move Up
 STR_AI_CONFIG_MOVE_UP_TOOLTIP                                   :{BLACK}Move selected AI up in the list