When a Realtor enters a listing onto the MLS most of the data is entered via pulldowns. However there are 3 fields where we actually type text. One is the remarks, the second is the confidential remarks, the third is in the supplement section.
The remarks holds about oh… a few lines of text, perhaps 1000 characters… that is a guess by the way. However many times homes have many more features that you wish to describe. So at the bottom of the listing there is a data entry field marked supplements. This field allows for a few thousand characters.
If you had an agent email you the true MLS listings then you would see the supplemental information. Recall that online MLS providers like zip and realtor.com all get thier database from every local MLS. The MLS distills some of the information that is released, for sure the CBB, the confidential remarks, as well as a few other minor things. I don’t know if the MLS distills out the supplemental information or Zip just cuts it. I know Realtor.com doesn’t list the supplemental information either. However on Realtor.com I know that I the listing agent can go into the listing and MANUALLY paste in the supplemental information so that buyers can see it.
So as a realtor when you fill in the remarks section, if you have more features you want to discuss or present to the buyer you typically type in See Supplement at the end of the Remarks entry.