diff --git a/README.md b/README.md
index bc57090..28cc846 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,19 @@
-# format-4690 README
+# Format-4690 README
 
-Hola
+Extensión para soporte del lenguaje 4690 BASIC de IBM
+
+Principales funcionalidades:
+* Resaltado de sintaxis.
+* Formateado/alineado de documento (default VS Code `Alt+Shift+F`).
+* Seguimiento de funciones/subrutinas (default VS Code `Alt+T`).
+* Ir a definición para funciones/subrutinas (default VS Code `Ctrl+ Click Izq.` sobre nombre/llamada de función/subrutina).
+* Información al colocar mouse sobre llamada de función/subrutina.
 
 ---
 
 ### 2025.08.04
 
 Inicial
+
+### 2025.09.23
+Correcciones de sintaxis
\ No newline at end of file
diff --git a/src/extension.ts b/src/extension.ts
index 45361f9..1423139 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -608,7 +608,6 @@ export async function activate(context: vscode.ExtensionContext) {
 			// Prefer definition from current document, otherwise use first one
 			const definition = definitions.find(def => def.location.uri.toString() === document.uri.toString()) || definitions[0];
 
-			
 
 			const content = new vscode.MarkdownString();
 
diff --git a/syntaxes/4690basic.tmLanguage.json b/syntaxes/4690basic.tmLanguage.json
index 1427a84..1b2ef07 100644
--- a/syntaxes/4690basic.tmLanguage.json
+++ b/syntaxes/4690basic.tmLanguage.json
@@ -154,7 +154,7 @@
 		},
 		"fun-sub-modifier": {
 			"name": "storage.modifer",
-			"match": "PUBLIC|public|EXTERNAL|external"
+			"match": "(?i)PUBLIC|EXTERNAL"
 		},
 		"subroutine-decl": {
 			"name": "meta.subroutine",