diff --git a/rc/default_config.toml b/rc/default_config.toml
new file mode 100644
index 0000000..f9204c3
--- /dev/null
+++ b/rc/default_config.toml
@@ -0,0 +1,8 @@
+[filetype.rust]
+group.identifier = ["identifier", "scoped_identifier"]
+group.function = ["function_item"]
+group.declaration = ["function_item", "struct_item", "enum_item"]
+group.call = ["macro_invocation", "call_expression"]
+group.arguments = ["arguments", "token_tree"]
+group.statement = ["expression_statement", "let_declaration"]
+
diff --git a/rc/tree.kak b/rc/tree.kak
index 1367159..348aa8c 100644
--- a/rc/tree.kak
+++ b/rc/tree.kak
@@ -1,8 +1,10 @@
 # Path to the kak-tree executable.
-# To load config:          set-option global tree_cmd "kak-tree --config /path/to/kak-tree.toml"
 # To enable debug logging: set-option global tree_cmd "kak-tree -vvv"
 declare-option str tree_cmd "kak-tree"
 
+# Path to the config file. Defaults to the built-in file default_config.toml
+declare-option str tree_config %sh{ printf "$(dirname ${kak_source})/default_config.toml" }
+
 # Path to the log file.
 declare-option str tree_log "/tmp/kak-tree.log"
 
@@ -33,7 +35,7 @@ content = """
 [op]
 type = "%s"
 %s
-' "${kak_opt_filetype}" "${kak_selections_desc}" "${tree_draft}" $1 "$2" | ${kak_opt_tree_cmd} 2>${kak_opt_tree_log}
+' "${kak_opt_filetype}" "${kak_selections_desc}" "${tree_draft}" $1 "$2" | ${kak_opt_tree_cmd} --config "${kak_opt_tree_config}" 2>${kak_opt_tree_log}
     }
 }
 
diff --git a/src/config.rs b/src/config.rs
index 1ef53a2..1536de0 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -31,8 +31,8 @@ impl Default for Config {
 
 impl Config {
     pub fn load<P: AsRef<std::path::Path>>(path: P) -> Option<Self> {
-        let config = std::fs::read_to_string(path).ok()?;
-        let mut config: Config = toml::from_str(&config).ok()?;
+        let config = std::fs::read_to_string(&path).map_err(|e| { eprintln!("Could not open config {}", path.as_ref().display()); e}).ok()?;
+        let mut config: Config = toml::from_str(&config).map_err(|e| { eprintln!("Could not read config: {e}"); e}).ok()?;
         if config.filetype.get("default").is_none() {
             config
                 .filetype