diff --git a/src/ci/citool/Cargo.toml b/src/ci/citool/Cargo.toml
index 40c6e5b4dc22..d6423d7ae4ba 100644
--- a/src/ci/citool/Cargo.toml
+++ b/src/ci/citool/Cargo.toml
@@ -10,4 +10,7 @@ serde = { version = "1", features = ["derive"] }
 serde_yaml = "0.9"
 serde_json = "1"
 
+# Tell cargo that citool is its own workspace.
+# If this is omitted, cargo will look for a workspace elsewhere.
+# We want to avoid this, since citool is independent of the other crates.
 [workspace]