diff --git a/README.md b/README.md
index 49ce8e0..e4c3c2b 100644
--- a/README.md
+++ b/README.md
@@ -56,8 +56,8 @@ A man page will be available by the time this filter is ready to use.
 
 Keys are stored in an SQLite format 3 database. You may access it using the `sqlite3` CLI tool or any other compatible tool.
 
-The simplest way to revoke a key is to set its `not_after` field at the current timestamp. A new key will automatically be generated.
+The simplest way to revoke a key is to set its `not_after` field at the current timestamp. A new key will automatically be generated. You may also set the `revocation` field to a different timestamp in order to publish the key when desired.
 
 ```
-UPDATE key_db SET not_after = unixepoch() WHERE selector = 'dkim-755512d8f51b4da6936d565a1ddbaf17';
+UPDATE key_db SET not_after = unixepoch(), revocation = unixepoch('now', '+20 days') WHERE selector = 'dkim-755512d8f51b4da6936d565a1ddbaf17';
 ```