diff --git a/c/reg_test/input/Makefile.am b/c/reg_test/input/Makefile.am
index dedd17c4d..99f54391e 100644
--- a/c/reg_test/input/Makefile.am
+++ b/c/reg_test/input/Makefile.am
@@ -78,6 +78,7 @@ EXTRA_DIST=	\
 		multi-sep.csv \
 		multi-sep.dkvp \
 		near-ovf.dkvp \
+		nullvals.dkvp \
 		null-fields.csv \
 		null-fields.nidx \
 		null-vs-empty.dkvp \
diff --git a/c/reg_test/input/nullvals.dkvp b/c/reg_test/input/nullvals.dkvp
new file mode 100644
index 000000000..2f78356da
--- /dev/null
+++ b/c/reg_test/input/nullvals.dkvp
@@ -0,0 +1,5 @@
+a=b,x=1,y=2,z=
+a=b,x=3,y=4,z=
+a=b,x=5,y=,z=
+a=b,x=,y=6,z=
+a=b,x=,y=,z=
diff --git a/c/todo.txt b/c/todo.txt
index ffe1db5e7..63a20c94f 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -6,7 +6,7 @@ BUGFIXES
 ================================================================
 TOP OF LIST
 
-! stats1 handle empty-key nulls? stats2? step? top? etc ...
+! handle empty-key nulls: stats1, stats2, merge-fields, step, top
   > UT
 
 * filter-then-put with capture-groups