diff --git a/CLI/Repl.cpp b/CLI/Repl.cpp
index aecddf38..06735d19 100644
--- a/CLI/Repl.cpp
+++ b/CLI/Repl.cpp
@@ -766,6 +766,7 @@ static void displayHelp(const char* argv0)
     printf("  --profile[=N]: profile the code using N Hz sampling (default 10000) and output results to profile.out\n");
     printf("  --timetrace: record compiler time tracing information into trace.json\n");
     printf("  --codegen: execute code using native code generation\n");
+    printf("  --fflags[=FLAGS], --fflags[True/False]: pass the comma separated flags or enable/disable all available flags.\n");
 }
 
 static int assertionHandler(const char* expr, const char* file, int line, const char* function)