diff --git a/bin/verilator b/bin/verilator
index 2c8a4ee88..235910133 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -515,6 +515,8 @@ unsized zero.  Arguments to such functions will be parsed, but not
 otherwise checked.  This prevents errors when linting in the presence of
 company specific PLI calls.
 
+Using this argument will likely cause incorrect simulation.
+
 =item --bbox-unsup
 
 Black box some unsupported language features, currently UDP tables, the
@@ -522,6 +524,8 @@ cmos and tran gate primitives, deassign statements, and mixed edge errors.
 This may enable linting the rest of the design even when unsupported
 constructs are present.
 
+Using this argument will likely cause incorrect simulation.
+
 =item --bin I<filename>
 
 Rarely needed.  Override the default filename for Verilator itself.  When a