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-rw-r--r--lib/libc_r/BENCH/null.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/libc_r/BENCH/null.c b/lib/libc_r/BENCH/null.c
index cbd7ad3a4f6..15436e18a66 100644
--- a/lib/libc_r/BENCH/null.c
+++ b/lib/libc_r/BENCH/null.c
@@ -6,7 +6,8 @@
static char name[] = "Null test";
static char doc[] =
"\tThe time needed for performing a tight empty loop. This indicates\n"
-"\tthe overhead incurred by the measurement harness.";
+"\tthe overhead incurred by the measurement harness. It should be zero,\n"
+"\tand may even be negative.";