diff --git a/install_and_test.md b/install_and_test.md
index e9c52eaab055d2c67c44a4a4d7afa9c1293fc2ca..a82ab7941a70b2e6d12588d7026f207e65e02449 100644
--- a/install_and_test.md
+++ b/install_and_test.md
@@ -31,8 +31,8 @@ Here below some relevant environment variables to change hotwheels default setti
 | `MPICC`             | MPI C compiler (defaults to `mpicc`).                                                                |
 | `CXX`               | C++ compiler (defaults to `g++`).                                                                    |
 | `MPICXX`            | MPI C++ compiler (defaults to `mpicxx`).                                                             |
+| `HW_FLAGS`          | Compilation specific flags (i.e. not used by clang for parsing).                                    |
 | `HW_BUILD`          | Folder with runtime-generated headers, and C/C++ compiled object files.                              |
-| `HW_DATA`           | Folder where downloaded test initial conditions (ICs) should be placed.                              |
 | `DEBUG`             | Set to `1` to enable additional verbose output for debugging purposes.                               |
 | `C_INCLUDE_PATH`    | *(used by the gnu compiler)* Search path for C headers, should include paths for required libraries like `gsl` and `fftw3`.       |
 | `CPLUS_INCLUDE_PATH`|  *(used by the gnu compiler)* Search path for C++ headers, should include paths for required libraries like `gsl` and `fftw3`.     |