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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 22a5c386..646db3f2 100644
--- a/docs/env_variables.md
+++ b/docs/env_variables.md
@@ -474,7 +474,8 @@ 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!
 
   - In QEMU mode (-Q) and FRIDA mode (-O), `AFL_PATH` will be searched for
     afl-qemu-trace and afl-frida-trace.so.