diff --git a/check_curl.sh b/check_curl.sh
index b0cdf69..dd7fe70 100755
--- a/check_curl.sh
+++ b/check_curl.sh
@@ -1,8 +1,24 @@
 #!/bin/bash
 
+usage() {
+  echo "Usage: $0 -u <url> [-w <warning>] [-c <critical>] [-C <contains>] [-L] [-I] [-H <headers>] [-p] [-R] [-s]"
+  echo "[Arguments]:
+  -u Specify the URL to check (required).
+  -w Set the warn level for response time (default: 1 second).
+  -c Set the critical level for response time (default: 2 seconds).
+  -C If the body does not contain this string, return CRITICAL.
+  -L Follow redirects.
+  -I Insecure mode (--insecure).
+  -H Specify headers. Formatted like \"Header1: value,Header2: value\"
+  -p Print the curl command and exit
+  -R Set curl --resolve option.
+  -s Ignore the response status code."
+  exit 3
+}
+
 # Default values
-WARN_TIME=1
-CRIT_TIME=2
+WARN_TIME=700
+CRIT_TIME=1000
 FOLLOW_REDIRECTS=""
 INSECURE=""
 HEADERS=""
@@ -12,7 +28,7 @@ IGNORE_STATUS=""
 TIMEOUT=""
 
 # Parse arguments
-while getopts "u:w:c:C:LH:IpR:st:" opt; do
+while getopts "u:w:c:C:LH:IpR:st:h" opt; do
   case $opt in
   u)
     URL="$OPTARG"
@@ -47,8 +63,12 @@ while getopts "u:w:c:C:LH:IpR:st:" opt; do
   t)
     TIMEOUT="--max-time $OPTARG"
     ;;
+  h)
+    usage
+    ;;
   *)
     echo "Invalid option: -$OPTARG" >&2
+    usage
     exit 3
     ;;
   esac
@@ -355,28 +375,29 @@ fi
 
 # Check HTTP code
 if [ "$IGNORE_STATUS" != "yes" ] && [ "$HTTP_CODE" -ne 200 ]; then
-  echo "CRITICAL - Server returned HTTP code $HTTP_CODE -> $URL"
+  echo "CRITICAL - server returned HTTP code $HTTP_CODE -> $URL"
   exit 2
 fi
 
+RESPONSE_TIME_MS=$(echo "$RESPONSE_TIME * 1000" | bc)
 # Check response time
-if [ $(echo "$RESPONSE_TIME > $CRIT_TIME" | bc) -eq 1 ]; then
-  echo "CRITICAL - Response time $RESPONSE_TIME seconds -> $URL | response_time=${RESPONSE_TIME}s"
+if [ $(echo "$RESPONSE_TIME_MS > $CRIT_TIME" | bc) -eq 1 ]; then
+  echo "CRITICAL - Response time $RESPONSE_TIME seconds -> $URL | response_time=${RESPONSE_TIME_MS}ms"
   exit 2
-elif [ $(echo "$RESPONSE_TIME > $WARN_TIME" | bc) -eq 1 ]; then
-  echo "WARNING - Response time $RESPONSE_TIME seconds -> $URL | response_time=${RESPONSE_TIME}s"
+elif [ $(echo "$RESPONSE_TIME_MS > $WARN_TIME" | bc) -eq 1 ]; then
+  echo "WARNING - response time $RESPONSE_TIME seconds -> $URL | response_time=${RESPONSE_TIME}s"
   exit 1
 fi
 
 # Check critical string
 if [ -n "$CRIT_STRING" ]; then
   BODY=$(curl -s $FOLLOW_REDIRECTS $INSECURE $HEADERS $RESOLVE $TIMEOUT $URL)
-  if [[ ! $BODY =~ $CRIT_STRING ]]; then
-    echo "CRITICAL - Response body does not contain '$CRIT_STRING'"
+  if ! echo "$BODY" | grep -q "$CRIT_STRING"; then
+    echo "CRITICAL - response body does not contain '$CRIT_STRING': $BODY"
     exit 2
   fi
 fi
 
 # All checks passed
-echo "OK - Response time $RESPONSE_TIME seconds -> $URL | response_time=${RESPONSE_TIME}s"
+echo "OK - response time was $RESPONSE_TIME seconds -> $URL | response_time=${RESPONSE_TIME_MS}ms;$WARN_TIME;$CRIT_TIME;0;;"
 exit 0