diff --git a/zsh/.config/zsh/zshrc.local b/zsh/.config/zsh/zshrc.local
index 20585e8..4a1082e 100644
--- a/zsh/.config/zsh/zshrc.local
+++ b/zsh/.config/zsh/zshrc.local
@@ -33,6 +33,7 @@ fi
 # rust/cargo
 if command -v cargo &> /dev/null; then
   # Add cargo binary directory to $PATH
+  # this assumes CARGO_HOME is unset
   path+=("$HOME/.cargo/bin")
 fi