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-rw-r--r--passes/sat/sim.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/passes/sat/sim.cc b/passes/sat/sim.cc
index c46c1509a..5e15faec0 100644
--- a/passes/sat/sim.cc
+++ b/passes/sat/sim.cc
@@ -1811,7 +1811,8 @@ struct SimPass : public Pass {
log(" writeback mode: use final simulation state as new init state\n");
log("\n");
log(" -r\n");
- log(" read simulation results file (file formats supported: FST)\n");
+ log(" read simulation results file (file formats supported: FST, VCD, AIW and WIT)\n");
+ log(" VCD support requires vcd2fst external tool to be present\n");
log("\n");
log(" -map <filename>\n");
log(" read file with port and latch symbols, needed for AIGER witness input\n");