diff --git a/docs/config.md b/docs/config.md
index b3a1629484..ec27c07e3b 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -222,6 +222,8 @@ You can configure the revisions `jj log` would show when neither `-r` nor any pa
 revsets.log = "main@origin.."
 ```
 
+The default value for `revsets.log` is `'@ | ancestors(immutable_heads().., 2) | trunk()'`.
+
 ### Graph style
 
 ```toml