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-rw-r--r--src/pattern_sim.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/pattern_sim.c b/src/pattern_sim.c
index 3deaa742..75755020 100644
--- a/src/pattern_sim.c
+++ b/src/pattern_sim.c
@@ -48,6 +48,8 @@ static void show_help(const char *s)
" intensities file)\n"
" --simulation-details Show technical details of the simulation.\n"
" --gpu Use the GPU to speed up the calculation.\n"
+" --gpu-dev=<n> Use GPU device <n>. Omit this option to see the\n"
+" available devices.\n"
" -g, --geometry=<file> Get detector geometry from file.\n"
" -b, --beam=<file> Get beam parameters from file.\n"
"\n"