Clarify CERT Variable Path in README

live_exam_os/README.md

@@ -60,7 +60,7 @@ Replace <image_name> with the name of your Docker image and <param> with the des
 | ROOTFS_DIR 	| Path to the temporary filesystem directory (e.g., out/rootfs). 	|
 | ISO_DIR    	| Path to the temporary ISO directory (e.g., out/iso).           	|
 | SERVER     	| IP address of the Nexus server (e.g., 127.0.0.1:1077).         	|
-| CERT       	| Path to the certificate file (e.g., ca-cert.pem).              	|
+| CERT       	| Path to the certificate file relative to the parent directory of live_exam_os. The path should be within the parent folder or a subdirectory of it, as the Docker container mounts the parent directory as a volume. For example, if ca-cert.pem is placed in the same directory as live_exam_os, set it to live_exam_os/ca-cert.pem. |
 | EXAM_USER  	| Default username for the exam client (e.g., user).             	|
 | EXAM_PWD   	| Default password for the exam client (e.g., password).         	|
 
@@ -76,7 +76,7 @@ export BOOT_FOLDER="$ISO_DIR/boot"
 
 # Nexus build configuration
 export SERVER="127.0.0.1:1077"
-export CERT="ca-cert.pem"
+export CERT="live_exam_os/ca-cert.pem"
 export EXAM_USER="user"
 export EXAM_PWD="password"