diff --git a/c_src/tracer/tpTracerNif.c b/c_src/tracer/tpTracerNif.c
index 540b513..866ead2 100644
--- a/c_src/tracer/tpTracerNif.c
+++ b/c_src/tracer/tpTracerNif.c
@@ -71,7 +71,6 @@ static void unload(ErlNifEnv* env, void* priv_data)
 }
 
 // enabled(TraceTag, TracerState, Tracee)
-
 static ERL_NIF_TERM enabled(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
     ERL_NIF_TERM tracers, value;
     ErlNifPid tracer;
@@ -139,6 +138,11 @@ static ERL_NIF_TERM enabled_send(ErlNifEnv *env, int argc, const ERL_NIF_TERM ar
 
 // trace(TraceTag, TracerState, Tracee, TraceTerm, Opts)
 static ERL_NIF_TERM trace(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+
+    for(int i = 0; i <= argc - 1; i++) {
+        enif_fprintf(stdout, "IMY************trace000 %T\n", argv[i]);
+    }
+
     ERL_NIF_TERM tracers, head, ts, extra, mspec, msg;
     ErlNifPid tracer;
     unsigned int nth;
diff --git a/src/eTpf.erl b/src/eTpf.erl
index ae072bc..86d54f3 100644
--- a/src/eTpf.erl
+++ b/src/eTpf.erl
@@ -78,7 +78,7 @@ ensureScope(Input) ->
 
 traceInput([], _, _) ->
    ok;
-traceInput([{scope, Scope} | Tail], TracerState, Opts) ->
+traceInput([{scope, Scope} | Tail], TracerState, TraceOpts) ->
    %% We currently enable the following trace flags:
    %% - call: function calls
    %% - procs: process exit events; plus others we ignore
@@ -90,15 +90,16 @@ traceInput([{scope, Scope} | Tail], TracerState, Opts) ->
    %%
    %% @todo It might be useful to count the number of sends
    %% or receives a function does.
-   ExtraFlags = [running || maps:get(running, Opts, false)] ++ [send || maps:get(send, Opts, false)],
+   ExtraFlags = [running || maps:get(running, TraceOpts, false)] ++ [send || maps:get(send, TraceOpts, false)],
    [
-      erlang:trace(PidPortSpec, true, [call, procs, timestamp, arity, return_to, set_on_spawn, {tracer, tpTracerNif, TracerState} | ExtraFlags])
-      || PidPortSpec <- Scope
+      begin
+         erlang:trace(PidPortSpec, true, [call, procs, monotonic_timestamp, arity, return_to, set_on_spawn, {tracer, tpTracerNif, TracerState} | ExtraFlags])
+      end || PidPortSpec <- Scope
    ],
-   traceInput(Tail, TracerState, Opts);
-traceInput([Mod | Tail], TracerState, Opts) when is_atom(Mod) ->
+   traceInput(Tail, TracerState, TraceOpts);
+traceInput([Mod | Tail], TracerState, TraceOpts) when is_atom(Mod) ->
    MatchSpec =
-      case Opts of
+      case TraceOpts of
          #{process_dump := true} ->
             [{'_', [], [{message, {process_dump}}]}];
          _ ->
@@ -107,7 +108,7 @@ traceInput([Mod | Tail], TracerState, Opts) when is_atom(Mod) ->
    %% The module must be loaded before we attempt to trace it.
    _ = code:ensure_loaded(Mod),
    _ = erlang:trace_pattern({Mod, '_', '_'}, MatchSpec, [local]),
-   traceInput(Tail, TracerState, Opts).
+   traceInput(Tail, TracerState, TraceOpts).
 
 stop() ->
    stop(?eTpfPoolId).