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-rw-r--r--docs/ChangeLog1
-rw-r--r--docs/env_variables.txt4
2 files changed, 5 insertions, 0 deletions
diff --git a/docs/ChangeLog b/docs/ChangeLog
index fa05d1b8..62cef237 100644
--- a/docs/ChangeLog
+++ b/docs/ChangeLog
@@ -21,6 +21,7 @@ Version ++2.54d (dev):
     FIFO or disk partition
   - reducing duplicate code in afl-fuzz
   - persistent mode for QEMU
+  - updated documentation
 
 
 --------------------------
diff --git a/docs/env_variables.txt b/docs/env_variables.txt
index cea3597b..4a39cc9a 100644
--- a/docs/env_variables.txt
+++ b/docs/env_variables.txt
@@ -201,6 +201,10 @@ checks or alter some of the more exotic semantics of the tool:
     mutated files - say, to fix up checksums. See experimental/post_library/
     for more.
 
+  - Setting AFL_CUSTOM_MUTATOR_LIBRARY to a shared library with
+    afl_custom_mutator() export will run all mutations solely to this function.
+    see docs/custom_mutator.txt
+
   - For AFL_PYTHON_MODULE and AFL_PYTHON_ONLY - they require to be compiled
     with -DUSE_PYTHON. Please see docs/python_mutators.txt
     This feature allows to configure custom mutators which can be very helpful