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-rw-r--r--utils/afl_proxy/README.md5
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diff --git a/utils/afl_proxy/README.md b/utils/afl_proxy/README.md
index 3c768a19..7965659d 100644
--- a/utils/afl_proxy/README.md
+++ b/utils/afl_proxy/README.md
@@ -7,3 +7,8 @@ You only need to change the while() loop of the main() to send the
 data of buf[] with length len to the target and write the coverage
 information to __afl_area_ptr[__afl_map_size]
 
+UPDATE: you can also use [custom mutators](../../docs/custom_mutators.md) with
+afl_custom_fuzz_send to send data to a target, which is much more efficient!
+But you can only use this feature if you start the target via afl-fuzz and
+a forkserver is active (e.g. via -Q qemu_mode or source compiled).
+