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-rw-r--r--docs/env_variables.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/env_variables.md b/docs/env_variables.md
index 7a574e59..6cd4104b 100644
--- a/docs/env_variables.md
+++ b/docs/env_variables.md
@@ -480,7 +480,8 @@ checks or alter some of the more exotic semantics of the tool:
     output from afl-fuzz is redirected to a file or to a pipe.
 
   - Setting `AFL_NO_STARTUP_CALIBRATION` will skip the initial calibration
-    of all starting seeds, and start fuzzing at once.
+    of all starting seeds, and start fuzzing at once. Use with care, this
+    degrades the fuzzing performance!
 
   - Setting `AFL_NO_WARN_INSTABILITY` will suppress instability warnings.