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-rw-r--r--docs/env_variables.md4
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diff --git a/docs/env_variables.md b/docs/env_variables.md
index a20f1e42..c6ad0aa4 100644
--- a/docs/env_variables.md
+++ b/docs/env_variables.md
@@ -393,6 +393,10 @@ checks or alter some of the more exotic semantics of the tool:
 
   - In QEMU mode (-Q), `AFL_PATH` will be searched for afl-qemu-trace.
 
+  - In QEMU mode (-Q), setting `AFL_QEMU_CUSTOM_BIN` cause afl-fuzz to skip
+    prepending `afl-qemu-trace` to your command line. Use this if you wish to use a
+    custom afl-qemu-trace or if you need to modify the afl-qemu-trace arguments.
+
   - Setting `AFL_CYCLE_SCHEDULES` will switch to a different schedule everytime
     a cycle is finished.