diff --git a/.emacs b/.emacs
index 812b9dd..5a54e9f 100644
--- a/.emacs
+++ b/.emacs
@@ -648,6 +648,27 @@
 		)
 	)
 
+(use-package polymode
+	:config
+	(define-hostmode poly-pio-hostmode
+		:mode 'asm-mode)
+
+	(define-innermode poly-pio-c-innermode
+		:mode 'c-mode
+		:head-matcher "^% c-sdk {$"
+		:tail-matcher "^%}$"
+		:head-mode 'host
+		:tail-mode 'host)
+
+	(define-polymode poly-pio-mode
+		:hostmode 'poly-pio-hostmode
+		:innermodes '(poly-pio-c-innermode))
+
+	(add-to-list 'auto-mode-alist '("\\.pio$" . poly-pio-mode))
+
+	)
+
+
 (use-package vterm)
 
 (use-package flycheck