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-rw-r--r--techlibs/common/simlib.v2
1 files changed, 2 insertions, 0 deletions
diff --git a/techlibs/common/simlib.v b/techlibs/common/simlib.v
index f16866e86..1b172c112 100644
--- a/techlibs/common/simlib.v
+++ b/techlibs/common/simlib.v
@@ -537,6 +537,8 @@ endmodule
// used in binary arithmetic operations. By replacing the ripple
// carry structure used in full-adder blocks, the more significant
// bits of the sum can be expected to be computed more quickly.
+// Typically created during `techmap` of $alu cells
+// (see the "_90_alu" rule in +/techmap.v)
module \$lcu (P, G, CI, CO);
parameter WIDTH = 1;