diff --git a/GUIDE.md b/GUIDE.md
index 7468bfd..012f34d 100644
--- a/GUIDE.md
+++ b/GUIDE.md
@@ -472,6 +472,7 @@ Duplicacy will attempt to retrieve in three ways the storage password and the st
 | BackBlaze Account ID | DUPLICACY_B2_ID | DUPLICACY_<STORAGENAME>_B2_ID | b2_id |
 | Backblaze Application Key | DUPLICACY_B2_KEY | DUPLICACY_<STORAGENAME>_B2_KEY | b2_key |
 | Azure Access Key | DUPLICACY_AZURE_KEY | DUPLICACY_<STORAGENAME>_AZURE_KEY | azure_key |
+| Google Drive Token File | DUPLICACY_GCD_TOKEN | DUPLICACY_<STORAGENAME>_GCD_TOKEN | gcd_token |
 
 Note that the passwords stored in the environment variable and the preference need to be in plaintext and thus are insecure and should be avoided whenever possible.