diff --git a/README.md b/README.md
index 89bcbd5..e59e6fa 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ printf '\x00' > /tmp/smite-seeds/empty
 # Start fuzzing with the custom mutator
 AFL_CUSTOM_MUTATOR_LIBRARY=target/release/libsmite_ir_mutator.so \
 AFL_CUSTOM_MUTATOR_ONLY=1 \
+AFL_FRAMESHIFT_DISABLE=1 \
 AFL_DISABLE_TRIM=1 \
 ~/AFLplusplus/afl-fuzz -X -i /tmp/smite-seeds -o /tmp/smite-out -- /tmp/smite-nyx
 ```
diff --git a/smite-ir-mutator/src/lib.rs b/smite-ir-mutator/src/lib.rs
index 0903ee2..870ec2e 100644
--- a/smite-ir-mutator/src/lib.rs
+++ b/smite-ir-mutator/src/lib.rs
@@ -13,6 +13,8 @@
 //! - `AFL_CUSTOM_MUTATOR_ONLY=1` -- disable AFL++'s byte mutators. This also
 //!   disables the havoc stage entirely, so we deliberately do not implement
 //!   `afl_custom_havoc_mutation`.
+//! - `AFL_FRAMESHIFT_DISABLE=1` -- disable AFL++'s `FrameShift` analysis that
+//!   bypasses our custom mutators.
 //! - `AFL_DISABLE_TRIM=1` -- this library does not implement custom trim and
 //!   AFL++'s default byte-level trim would corrupt our structured programs.
 //!