Provide format hints in the example config file.
# Routinator Configuration
#
-# The configuration file is a TOML file. See https://github.com/toml-lang/toml
-# for information on the format.
+# The configuration file is a TOML file. It consists of a sequence of
+# key-value pairs, each on its own line. Strings are to be enclosed in
+# double quotes. Lists of values can be given by enclosing a
+# comma-separated sequence of these values in square brackets.
+#
+# See https://github.com/toml-lang/toml for detailed information on the
+# format.
#
# This file contains all configuration settings with explanations and their
# default values.
#
# This setting is mandatory.
#
-repository-dir = ...
+repository-dir = "..."
# Trust Anchor Locator (TAL) directory
#
@@ -26,7 +31,7 @@ repository-dir = ...
#
# This setting is mandatory.
#
-tal-dir = ...
+tal-dir = "..."
# Local exceptions files
#
