diff --git a/README.md b/README.md
index 4b9ca734c..ce3cf82d6 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ $ rm -rf externals/sirit/externals
 Then edit `externals/sirit/CMakeLists.txt` and enable "Use system SPIR-V Headers".
 Like this:
 
-```
+```c
 option(SIRIT_USE_SYSTEM_SPIRV_HEADERS "Use system SPIR-V headers" ON)
 ```
 
@@ -33,13 +33,13 @@ option(SIRIT_USE_SYSTEM_SPIRV_HEADERS "Use system SPIR-V headers" ON)
 
 Open `externals/mbedtls/include/mbedtls/config.h` with a text editor and search for the following line:
 
-```
+```cpp
 //#define MBEDTLS_CMAC_C
 ```
 
 You should uncomment that so it ends like this:
 
-```
+```cpp
 #define MBEDTLS_CMAC_C
 ```