diff --git a/scripts/install_config.sh b/scripts/install_config.sh
index 04701dd..665d482 100755
--- a/scripts/install_config.sh
+++ b/scripts/install_config.sh
@@ -270,6 +270,9 @@ RAW_SPECTROGRAM=0
 CUSTOM_IMAGE=
 CUSTOM_IMAGE_TITLE=""
 
+## RARE_SPECIES_THRESHOLD defines after how many days a species is considered as rare and highlighted on overview page
+RARE_SPECIES_THRESHOLD=30
+
 ## These are just for debugging
 LAST_RUN=
 THIS_RUN=