diff --git a/bastion/src/bastion.rs b/bastion/src/bastion.rs
index 849f8de6..a6b4062f 100644
--- a/bastion/src/bastion.rs
+++ b/bastion/src/bastion.rs
@@ -273,6 +273,9 @@ impl Bastion {
     /// created children group it it succeeded, or `Err(())`
     /// otherwise.
     ///
+    /// Note that the "system supervisor" is a supervisor created
+    /// by the system at startup.
+    ///
     /// # Arguments
     ///
     /// * `init` - The closure taking the new [`Children`] as an