diff --git a/README.md b/README.md
index 8a81737..cd3459f 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ Dec8s(any signed expr);, same of course Dec16u(); and Dec16s();
 Code size has been obtained by calling one function at a time, compiler under the usual -0s mode. Size is the difference with the empty file size. TerSer.h can of course be used with setup() and loop(). It add the ~300 bytes Arduino initializations.
 Execution time has been measured with a Nop replacing the SendCar function. The time depends on the baud rate, ~1 ms per character displayed at 9600 bits/s.
 
-```
+```c
 //TerSer.ino  Terminal série 174b 0v
 #include "TerSer.h"
 int main() {
@@ -77,7 +77,7 @@ while(1) {     add 174b for total size
 } // end while(1)
 } // end main() 
 ```
-```
+```c++
 // PrintArdui vide 1426b  184v
 void setup() {
  Serial.begin(9600);