diff --git a/zutil/zutil-tblr.code.tex b/zutil/zutil-tblr.code.tex
index 8a685f0..43cd35d 100644
--- a/zutil/zutil-tblr.code.tex
+++ b/zutil/zutil-tblr.code.tex
@@ -10,6 +10,18 @@
     The~existing~definition~of~'#2'~will~not~be~altered.
   }
 
+% It can be defined as simple as
+%     %<@@=seq>
+%     \cs_new_protected:Npn \zutil_seq_set_split_keep_braces:Nnn
+%       { \@@_set_split:NNNnn \__kernel_tl_set:Nx
+%           \__zutil_seq_trim_spaces:n }
+% so differs from \seq_set_split:Nnn and \seq_set_split_keep_spaces:Nnn
+% by only the space trimming function:
+%     \cs_new_protected:Npn \seq_set_split:Nnn
+%       { \@@_set_split:NNNnn \__kernel_tl_set:Nx \tl_trim_spaces:n }
+%     \cs_new_protected:Npn \seq_set_split_keep_spaces:Nnn
+%       { \@@_set_split:NNNnn \__kernel_tl_set:Nx \exp_not:n }
+% but I insist on raising an error on empty delimiter.
 \cs_new_protected:Npn \zutil_seq_set_split_keep_braces:Nnn #1
   {
     \__zutil_seq_set_split:NNNNnn
@@ -18,6 +30,7 @@
   }
 \cs_generate_variant:Nn \zutil_seq_set_split_keep_braces:Nnn { NnV }
 
+% gset version
 \cs_new_protected:Npn \zutil_seq_gset_split_keep_braces:Nnn #1
   {
     \__zutil_seq_set_split:NNNNnn
@@ -32,7 +45,7 @@
 \cs_new:Npn \__zutil_seq_trim_spaces:n #1 { { \tl_trim_spaces:n {#1} } }
 
 % Compared to \__seq_set_split:NNNnn, a forth N-arg is added which
-% holds the user function, i.e. \zutil_seq_set_split_keep_braces:Nnn,
+% holds the caller, i.e. \zutil_seq_set_split_keep_braces:Nnn,
 % for use in error message.
 %
 % l3seq internals \__seq_set_split:Nw and \l__seq_internal_a_tl, along