diff --git a/arduino-ide-extension/src/common/protocol/sketches-service.ts b/arduino-ide-extension/src/common/protocol/sketches-service.ts
index f521a205f..d3372030e 100644
--- a/arduino-ide-extension/src/common/protocol/sketches-service.ts
+++ b/arduino-ide-extension/src/common/protocol/sketches-service.ts
@@ -87,7 +87,7 @@ export namespace Sketch {
     export namespace Extensions {
         export const MAIN = ['.ino', '.pde'];
         export const SOURCE = ['.c', '.cpp', '.s'];
-        export const ADDITIONAL = ['.h', '.c', '.hpp', '.hh', '.cpp', '.s', '.json'];
+        export const ADDITIONAL = ['.h', '.c', '.hpp', '.hh', '.cpp', '.S', '.json', '.md', '.adoc'];
         export const ALL = Array.from(new Set([...MAIN, ...SOURCE, ...ADDITIONAL]));
     }
     export function isInSketch(uri: string | URI, sketch: Sketch): boolean {