docs: fix cxx -> cpp

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/markdown/Design-rationale.md b/docs/markdown/Design-rationale.md
index 67fec0ab3..41339794d 100644
--- a/docs/markdown/Design-rationale.md
+++ b/docs/markdown/Design-rationale.md
@@ -236,7 +236,7 @@ Above we mentioned precompiled headers as a feature not supported by
 other build systems. Here's how you would use them.
 
 ```meson
-project('pch demo', 'cxx')
+project('pch demo', 'cpp')
 executable('myapp', 'myapp.cpp', pch : 'pch/myapp.hh')
 ```