X-Git-Url: http://nitlanguage.org

diff --git a/src/loader.nit b/src/loader.nit
index 21b7a14..c80b6dc 100644
--- a/src/loader.nit
+++ b/src/loader.nit
@@ -42,13 +42,13 @@ import ini
 
 redef class ToolContext
 	# Option --path
-	var opt_path = new OptionArray("Set include path for loaders (may be used more than once)", "-I", "--path")
+	var opt_path = new OptionArray("Add an additional include path (may be used more than once)", "-I", "--path")
 
 	# Option --only-metamodel
 	var opt_only_metamodel = new OptionBool("Stop after meta-model processing", "--only-metamodel")
 
 	# Option --only-parse
-	var opt_only_parse = new OptionBool("Only proceed to parse step of loaders", "--only-parse")
+	var opt_only_parse = new OptionBool("Only proceed to parse files", "--only-parse")
 
 	redef init
 	do
@@ -152,6 +152,11 @@ redef class ModelBuilder
 
 			var mmodule = identify_module(a)
 			if mmodule == null then
+				if a.file_exists then
+					toolcontext.error(null, "Error: `{a}` is not a Nit source file.")
+				else
+					toolcontext.error(null, "Error: cannot find module `{a}`.")
+				end
 				continue
 			end