diff --git a/github/check.adguard.update b/github/check.adguard.update
index bc6a937..fed5daa 100755
--- a/github/check.adguard.update
+++ b/github/check.adguard.update
@@ -30,12 +30,16 @@ readonly COLOR_DEBUG="${PURPLE}"
 
 script_wd=$(dirname "${0}")
 adguard_repo_url="https://github.com/AdguardTeam/AdGuardHome"
+
+# Default values for some vars
+readonly ADGUARD_BIN_DEFAULT="/opt/adguard/AdGuardHome/AdGuardHome"
+readonly ADGUARD_NEW_VERSION_FILE_DEFAULT="/tmp/.adguard.upgrade"
 # }}}
 
 usage() {                                                       # {{{
 
 	cat <<- EOF
-usage: $PROGNAME [-b|-d|-f|-h]
+usage: $PROGNAME [-b|-d|-f|-h|-u]
 Compare current version of an installed AdGuard Home bin and the last available.
 
 EXAMPLE :
@@ -48,11 +52,11 @@ EXAMPLE :
 OPTIONS :
     -b,--bin
         Specify the path of AdGuard Home's binary
-        (default: /opt/adguard/AdGuardHome/AdGuardHome).
+        (default: ${ADGUARD_BIN_DEFAULT}).
 
     -f,--file
         Set the path to the temp file that will be create and
-        that should be monitored (default: /tmp/.adguard.upgrade).
+        that should be monitored (default: ${ADGUARD_NEW_VERSION_FILE_DEFAULT}).
 
     -d,--debug
         Enable debug messages.
@@ -117,14 +121,13 @@ define_vars() {                                                 # {{{
 	## If adguard_bin wasn't defined (argument,...) {{{
 	if [ -z "${adguard_bin}" ]; then
 		### Use default value
-		adguard_bin="/opt/adguard/AdGuardHome/AdGuardHome"
+		adguard_bin="${ADGUARD_BIN_DEFAULT}"
 	fi
 	## }}}
-
 	## If adguard_new_version_file wasn't defined (argument,...) {{{
 	if [ -z "${adguard_new_version_file}" ]; then
-		### Store it in /tmp directory
-		adguard_new_version_file="/tmp/.adguard.upgrade"
+		### Use default value
+		adguard_new_version_file="${ADGUARD_NEW_VERSION_FILE_DEFAULT}"
 	fi
 	## }}}