Document non-repeat-refresh of file under preview

plugins/README.md

@@ -204,6 +204,8 @@ If a `NNN_FIFO` environment variable is set globally (and `-a` is not passed to
 
 Don't forget to fork in the background to avoid blocking `nnn`.
 
+Note that `nnn` does not watch the hovered file and update the path if it's modified while under preview.
+
 #### Examples
 There are many plugins provided by `nnn` which can be used as examples. Here are a few simple selected examples.