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-rw-r--r--docs/ENVIRONMENT.md12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index ab10a4fc7e..ad2d3ad84b 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -301,3 +301,15 @@ installed systemd tests:
* `$SYSTEMD_SYSVRCND_PATH` — Controls where `systemd-sysv-generator` looks for
SysV init script runlevel link farms.
+
+fuzzers:
+
+* `$SYSTEMD_FUZZ_OUTPUT` — A boolean that specifies whether to write output to
+ stdout. Setting to true is useful in manual invocations, since all output is
+ suppressed by default.
+
+* `$SYSTEMD_FUZZ_RUNS` — The number of times execution should be repeated in
+ manual invocations.
+
+Note that is may be also useful to set `$SYSTEMD_LOG_LEVEL`, since all logging
+is suppressed by default.