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-rw-r--r--src/pattern_sim.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/pattern_sim.c b/src/pattern_sim.c
index d076eb7f..9a00b5d7 100644
--- a/src/pattern_sim.c
+++ b/src/pattern_sim.c
@@ -99,7 +99,9 @@ static void show_details()
" S = solid angle of corresponding pixel\n"
"\n"
"Poisson counts are generated from the expected intensities using Knuth's\n"
-"algorithm.\n"
+"algorithm. When the intensity is sufficiently high that Knuth's algorithm\n"
+"would result in machine precision problems, a normal distribution with\n"
+"standard deviation sqrt(I) is used instead.\n"
"\n"
"Bloom of the CCD is included. Any excess intensity in a particular pixel\n"
"is divided between the neighbouring pixels. Diagonal neighbours receive\n"