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-rw-r--r--src/afl-cc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/afl-cc.c b/src/afl-cc.c
index 1f89bac5..132f5f83 100644
--- a/src/afl-cc.c
+++ b/src/afl-cc.c
@@ -1757,6 +1757,7 @@ int main(int argc, char **argv, char **envp) {
         SAYF(
             "\nLLVM/LTO/afl-clang-fast/afl-clang-lto specific environment "
             "variables:\n"
+            "  AFL_LLVM_THREADSAFE_INST: instrument with thread safe counters\n"
 
             COUNTER_BEHAVIOUR