diff --git a/lib/core/libimagrt/src/runtime.rs b/lib/core/libimagrt/src/runtime.rs
index 093bd3cc..ed1bdc7e 100644
--- a/lib/core/libimagrt/src/runtime.rs
+++ b/lib/core/libimagrt/src/runtime.rs
@@ -175,7 +175,7 @@ impl<'a> Runtime<'a> {
             .arg(Arg::with_name(Runtime::arg_verbosity_name())
                 .short("v")
                 .long("verbose")
-                .help("Enables verbosity, can be used to set log level to one of 'trace', 'debug', 'info', 'warn' or 'error'")
+                .help("Set log level")
                 .required(false)
                 .takes_value(true)
                 .possible_values(&["trace", "debug", "info", "warn", "error"])
@@ -184,7 +184,7 @@ impl<'a> Runtime<'a> {
 
             .arg(Arg::with_name(Runtime::arg_debugging_name())
                 .long("debug")
-                .help("Enables debugging output")
+                .help("Enables debugging output. Shortcut for '--verbose debug'")
                 .required(false)
                 .takes_value(false))
 
@@ -198,6 +198,7 @@ impl<'a> Runtime<'a> {
                 .long("config")
                 .help("Path to alternative config file")
                 .required(false)
+                .validator(::libimagutil::cli_validators::is_existing_path)
                 .takes_value(true))
 
             .arg(Arg::with_name(Runtime::arg_config_override_name())
@@ -210,12 +211,14 @@ impl<'a> Runtime<'a> {
                 .long("rtp")
                 .help("Alternative runtimepath")
                 .required(false)
+                .validator(::libimagutil::cli_validators::is_directory)
                 .takes_value(true))
 
             .arg(Arg::with_name(Runtime::arg_storepath_name())
                 .long("store")
                 .help("Alternative storepath. Must be specified as full path, can be outside of the RTP")
                 .required(false)
+                .validator(::libimagutil::cli_validators::is_directory)
                 .takes_value(true))
 
             .arg(Arg::with_name(Runtime::arg_editor_name())