Clarify

diff --git a/passes/pmgen/xilinx_dsp.cc b/passes/pmgen/xilinx_dsp.cc
index adc09a6e42e0ab95fec70b8079f471df7d97a236..abd1457232a7b283024a358a22126eb9284bba55 100644 (file)
--- a/passes/pmgen/xilinx_dsp.cc
+++ b/passes/pmgen/xilinx_dsp.cc
@@ -507,7 +507,8 @@ struct XilinxDspPass : public Pass {
                log("\n");
                log("Multiply-accumulate operations using the post-adder with feedback on the 'C'\n");
                log("input will be folded into the DSP. In this scenario only, the 'C' input can be\n");
-               log("used to override the existing accumulation result with a new value.\n");
+               log("used to override the current accumulation result with a new value, which will\n");
+        log("be added to the multiplier result to form the next accumulation result.\n");
                log("\n");
                log("Use of the dedicated 'PCOUT' -> 'PCIN' cascade path is detected for 'P' -> 'C'\n");
                log("connections (optionally, where 'P' is right-shifted by 18-bits and used as an\n");