diff --git a/fuzz/FUZZING.md b/fuzz/FUZZING.md
index 65363e1ac1..357b323b7d 100644
--- a/fuzz/FUZZING.md
+++ b/fuzz/FUZZING.md
@@ -18,10 +18,10 @@ The tests in this directory can be operated in three modes:
 * non-fuzzing - the test just runs over all input located in `<test_name>.in/`
   directory by compiling with mock main.c that walks through the directory and
   runs `LLVMFuzzerTestOneInput()` over the input files
-* AFL - `./configure --with-fuzzing=afl` will either feed the stdin to
+* AFL - `./configure --enable-fuzzing=afl` will either feed the stdin to
   `LLVMFuzzerTestOneInput()` or run the `__AFL_LOOP(10000)` if compiled with
-  `afl-clang-fast`
-* LibFuzzer - `./configure --with-fuzzing=libfuzzer` will disable `main.c`
+  `afl-clang-fast`. You have to compile using `CC=afl-<gcc|clang>`.
+* LibFuzzer - `./configure --enable-fuzzing=libfuzzer` will disable `main.c`
   completely and it uses the standard LibFuzzer mechanims to feed
   `LLVMFuzzerTestOneInput` with the fuzzer