Sure, here you go.
Steps:
1. Add zAlgComment to cr schema and publish changes (should be a string with length 4000)
2. Create a zAlg.mod and zAlg.spl file and place in nx_root/site/mods/magic directory of all sdm servers
3. Restart sdm services
zAlg.mod file
MODIFY alg POST_CI zCRComment(call_req_id,description) 10000 FILTER(type == "LOG" && EVENT("INSERT UPDATE"));
zAlg.spl file
alg::zCRComment(...)
{
string method,persid,description;
uuid who;
method ="alg::zCRComment";
logf(MILESTONE, "%s started", method);
persid = argv[3];
description = argv[6];
send_wait(0,top_object(), "call_attr", "cnt", "current_user_id");
who=msg[0];
send_wait(0, top_object(), "call_attr", "api", "update_object_super", who, persid, 0, "zAlgComment", description);
logf(MILESTONE, "%s ended", method);
}