diff --git a/highlighter.go b/highlighter.go
index 4f26d3d..f5a01d5 100644
--- a/highlighter.go
+++ b/highlighter.go
@@ -73,12 +73,12 @@ func ParseSyntaxFiles(dir string, defs *[]*Def) (error, []string) {
 	for _, file_path := range files {
 		file, err := ioutil.ReadFile(file_path)
 		if err != nil {
-			warnings = append(warnings, err.Error())
+			warnings = append(warnings, file_path+": "+err.Error())
 		} else {
 			if len(file) > 0 {
 				d, err := ParseDef(file)
 				if err != nil {
-					warnings = append(warnings, err.Error())
+					warnings = append(warnings, file_path+": "+err.Error())
 				} else {
 					*defs = append(*defs, d)
 				}
diff --git a/syntax_files/du.yaml b/syntax_files/du.yaml
new file mode 100644
index 0000000..315b5ef
--- /dev/null
+++ b/syntax_files/du.yaml
@@ -0,0 +1,22 @@
+filetype: du
+
+detect: 
+    filename: "\\.du$"
+
+rules:
+  - blue: "\\s+[\\.\\/]+([\\w\\s\\-\\_\\.]+)(\\/.*)?$"
+  # Ks
+  - green: "^\\d{1,3}\\s"
+  - green: "^ ?\\d*[.,]?\\dKi?\\s"
+  # Ms
+  - magenta: "\\d{4,6}\\s"
+  - magenta: "^ ?\\d*[.,]?\\dMi?\\s"
+  # Gs
+  - cyan: "^\\d{7,9}\\s"
+  - cyan: "^ ?\\d*[.,]?\\dGi?\\s"
+  # Ts
+  - preproc: "^\\d{10,12}\\s"
+  - preproc: "^ ?\\d*[.,]?\\dTi?\\s"
+  # total
+  - yellow: "(.*)\\s+(total)$"
+