diff --git a/bin/verilator b/bin/verilator
index 81d17cd12..62c23bbca 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -2330,6 +2330,12 @@ Call Verilated::assertOn(false) before you first call the model, then turn
 it back on after reset.  It defaults to true.  When false, all assertions
 controlled by --assert are disabled.
 
+=item Why do I get "undefined reference to `get_datap()'"?
+
+You need to apply the SystemC patches that are provided with the SystemPerl
+kit.  These enable fast tracing of SystemC sc_bv<> signals.  Recompiling
+SystemC is not needed, it's just a header change.
+
 =item Why do I get "undefined reference to `sc_time_stamp()'"?
 
 In C++ (non SystemC) code you need to define this function so that the