diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..0f947ebe
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+# define GitHub repository languages
+*.puml linguist-language=PlantUML
+*.iuml linguist-language=PlantUML
+*.plantuml linguist-language=PlantUML
+
+*.puml linguist-detectable=true
+*.iuml linguist-detectable=true
+*.plantuml linguist-detectable=true
+*.md linguist-detectable=false