Clarify 'wreduce -keepdc' doc

diff --git a/passes/opt/wreduce.cc b/passes/opt/wreduce.cc
index 1fbc4108264618c0f5aa288e1cec6ee970afbad8..f749c824941b9ac20e47a15eb8f94c857a91b594 100644 (file)
--- a/passes/opt/wreduce.cc
+++ b/passes/opt/wreduce.cc
@@ -497,7 +497,7 @@ struct WreducePass : public Pass {
                log("        flows that use the 'memory_memx' pass.\n");
                log("\n");
                log("    -keepdc\n");
-               log("        Do not optimize explicit don't-care values.\n");
+               log("        Do not optimize explicit don't-care values on $mux cells.\n");
                log("\n");
        }
        void execute(std::vector<std::string> args, Design *design) YS_OVERRIDE