diff --git a/Project-Setup.md b/Project-Setup.md
index 03d9425..dd93c83 100644
--- a/Project-Setup.md
+++ b/Project-Setup.md
@@ -160,6 +160,11 @@ _appended_ to the compiler flags for files found in `compile_commands.json`.
 This argument should be added only when parsing C (`%c`), C++ (`%cpp`),
 Objective-C (`%objective-c`), or Objective-C++ (`%objective-c++`) files.
 
+### `%cu
+
+This argument should be added only when parsing CUDA files. If you want an option to be added
+to both CUDA and regular C++ files, write `%cpp %cu -DA`.
+
 ### `%h` / `%hpp`
 
 This argument should be added only when indexing C header files (`%h`: `*.h`) or C++
@@ -276,4 +281,4 @@ mkdir Debug; cd Debug
 ../configure --enable-optimize=no --enable-debug --prefix=~/.local/stow/musl
 bear make -j
 cd ..; ln -s Debug/compile_commands.json
-```
\ No newline at end of file
+```