diff --git a/CHANGELOG.md b/CHANGELOG.md
index 841cf9e..f1c7c75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,7 +33,7 @@ Following community feedback on Issue #9, additional improvements aligned with N
 
 - Eliminated `pkgs.writeShellScript` wrapper for credential loading
 - Uses systemd's `%d` placeholder for credentials directory
-- Cleaner implementation: `RUSTFS_ACCESS_KEY = "file:%d/access-key"`
+- Cleaner implementation: `RUSTFS_ACCESS_KEY_FILE = "%d/access-key"`
 - Direct binary execution without wrapper script
 
 #### Default to Systemd Journal Logging
diff --git a/docs/IMPROVEMENTS.md b/docs/IMPROVEMENTS.md
index 1ca62ea..bade162 100644
--- a/docs/IMPROVEMENTS.md
+++ b/docs/IMPROVEMENTS.md
@@ -49,8 +49,8 @@ environment = {
 # Before: Shell script wrapper reading from $CREDENTIALS_DIRECTORY
 # After: Direct environment variable with %d placeholder
 environment = {
-  RUSTFS_ACCESS_KEY = "file:%d/access-key";
-  RUSTFS_SECRET_KEY = "file:%d/secret-key";
+  RUSTFS_ACCESS_KEY_FILE = "%d/access-key";
+  RUSTFS_SECRET_KEY_FILE = "%d/secret-key";
 };
 ExecStart = "${cfg.package}/bin/rustfs";  # Direct execution
 ```
@@ -102,8 +102,8 @@ LoadCredential = [
 # Secrets referenced via %d placeholder in environment variables
 # This is cleaner and more idiomatic than using a shell script wrapper
 environment = {
-  RUSTFS_ACCESS_KEY = "file:%d/access-key";
-  RUSTFS_SECRET_KEY = "file:%d/secret-key";
+  RUSTFS_ACCESS_KEY_FILE = "%d/access-key";
+  RUSTFS_SECRET_KEY_FILE = "%d/secret-key";
   # ...other environment variables
 };