diff --git a/README.md b/README.md
index 8087ea7..fbfd98a 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ The comment posted by ksnotify is as follows:
 Create and export GitLab access token to environmental variables as follows:
 
 ```console
-export GITLAB_TOKEN="xxxxxx"
+export KSNOTIFY_GITLAB_TOKEN="xxxxxx"
 ```
 ref: [Project access tokens | GitLab](https://docs.gitlab.com/ee/user/project/settings/project_access_tokens.html)
 
@@ -64,8 +64,8 @@ Basic usage is as follows:
 skaffold render -p dev | kubectl diff -f - 2> /dev/null | | ksnotify --notifier gitlab --ci gitlab
 ```
 
-To suppress `skaffold` labels like `skaffold.dev/run-id: 1234` automatically added by `skaffold`, you should declare
+To suppress `skaffold` labels like `skaffold.dev/run-id: 1234` automatically added by `skaffold`, you should add `--suppress-skaffold` flag like
 
 ```console
-export KSNOTIFY_SUPPRESS_SKAFFOLD=1
+skaffold render -p dev | kubectl diff -f - 2> /dev/null | | ksnotify --notifier gitlab --ci gitlab --suppress-skaffold
 ```
diff --git a/src/notifier/gitlab.rs b/src/notifier/gitlab.rs
index 44a9d19..419e509 100644
--- a/src/notifier/gitlab.rs
+++ b/src/notifier/gitlab.rs
@@ -8,7 +8,7 @@ use std::env;
 
 use super::Notifiable;
 
-const ENV_GITLAB_TOKEN: &str = "GITLAB_TOKEN";
+const ENV_GITLAB_TOKEN: &str = "KSNOTIFY_GITLAB_TOKEN";
 
 #[derive(Debug)]
 pub struct GitlabNotifier {