Update README.md

add small docstring case in Guidelines

README.md

@@ -97,12 +97,32 @@ DEFUN_DLD (libsvmread, args, nargout,
 This function ...
 ````
 
+* Small docstrings containing a single line of help text after the `@deftypefn` tag must have an additional empty line before `@end deftypefn` in order to be parsed correclty. For example, the following docstring
+````
+## -*- texinfo -*-
+## @deftypefn {RTree} {@var{n} =} rect_size ()
+##
+## The size @var{n} in bytes of a rectangle.
+## @end deftypefn
+````
+must be
+````
+## -*- texinfo -*-
+## @deftypefn {RTree} {@var{n} =} rect_size ()
+##
+## The size @var{n} in bytes of a rectangle.
+##
+## @end deftypefn
+````
+in order to be properly formatted in final HTML code.
+
 * `@math{}` texi tags are converted to `<math></math>` tags in HTML and their contents are scanned for `x` and `*` characters, which are replaced by `&times;` in order to properly display the multiplication symbol. Make sure that lower case `x` within the `@math{}` tags is explicitly used for denoting multiplication and it is not used for anything else (e.g. variable name).  This feature, introduced in release 0.4.7, only affects the contents of `@math{}` texi tags. 
 
 * At the moment, `function_texi2html` can handle a signle `@seealso{}` tag. Make sure that there is only one `@seealso{}` tag inside each function's docstring located at the very end just before the `@end deftypefn` texinfo closing statement. Functions listed therein that belong to the same package are also linked to their individual function pages.
 
 * `@tex` tags must only contain latex mathematical expressions enclosed with `$$` identifiers, such as in `$$ ... $$`. Math delimiters `\(...\)` are also processed in `@tex` blocks.
 
+
 ## TODO
 
 1. Implement functionality for listing alphabetically all functions available