diff --git a/expr_synth.cc b/expr_synth.cc
index 9e619aa9f..77f83f207 100644
--- a/expr_synth.cc
+++ b/expr_synth.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: expr_synth.cc,v 1.29 2001/11/29 01:58:18 steve Exp $"
+#ident "$Id: expr_synth.cc,v 1.30 2001/12/18 05:34:02 steve Exp $"
 #endif
 
 # include "config.h"
@@ -481,7 +481,12 @@ NetNet* NetEUReduce::synthesize(Design*des)
       return osig;
 }
 
-
+/*
+ * Synthesize a ?: operator an a NetMux device. Connect the condition
+ * expression to the select input, then connect the true and false
+ * expressions to the B and A inputs. This way, when the select input
+ * is one, the B input, which is the true expression, is selected.
+ */
 NetNet* NetETernary::synthesize(Design *des)
 {
       NetNet*csig = cond_->synthesize(des);
@@ -562,6 +567,9 @@ NetNet* NetESignal::synthesize(Design*des)
 
 /*
  * $Log: expr_synth.cc,v $
+ * Revision 1.30  2001/12/18 05:34:02  steve
+ *  Comments about MUX synthesis.
+ *
  * Revision 1.29  2001/11/29 01:58:18  steve
  *  Handle part selects in l-values of DFF devices.
  *
diff --git a/t-dll.cc b/t-dll.cc
index d3a963b40..abca24b07 100644
--- a/t-dll.cc
+++ b/t-dll.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #if !defined(WINNT) && !defined(macintosh)
-#ident "$Id: t-dll.cc,v 1.73 2001/12/15 02:13:17 steve Exp $"
+#ident "$Id: t-dll.cc,v 1.74 2001/12/18 05:34:02 steve Exp $"
 #endif
 
 # include "config.h"
@@ -1347,6 +1347,10 @@ void dll_target::lpm_mult(const NetMult*net)
       scope_add_lpm(obj->scope, obj);
 }
 
+/*
+ * Hook up the mux devices so that the select expression selects the
+ * correct sub-expression with the ivl_lpm_data2 function.
+ */
 void dll_target::lpm_mux(const NetMux*net)
 {
       ivl_lpm_t obj = new struct ivl_lpm_s;
@@ -1719,6 +1723,9 @@ extern const struct target tgt_dll = { "dll", &dll_target_obj };
 
 /*
  * $Log: t-dll.cc,v $
+ * Revision 1.74  2001/12/18 05:34:02  steve
+ *  Comments about MUX synthesis.
+ *
  * Revision 1.73  2001/12/15 02:13:17  steve
  *  The IVL_SIT_WIRE type does not exist, it is a
  *  synonym for IVL_SIT_TRI.