doc: update README.md & ford project file

README.md

@@ -47,12 +47,13 @@ Classes
 
 Prerequisites
 -------------
-The following are the versions or commits currently employed in
-developing and testing.  Earlier versions or commits might work also.
+The following are the prerequisite package versions/commits currently
+employed in developing and testing (_earlier versions/commits might work also_):
 
 * Compiler: [GNU Fortran] (gfortran) 10.2.0
-* Parallel runtime library: [OpenCoarrays] 2.9.0
+* Parallel runtime library: [OpenCoarrays] 2.9.2
 * Fortran package manager: [fpm] 7d320295c6fe56cc767b352bd26f0466aa29ac5c
+* _Optional_: [FORD] 6.0.0 for producing HTML documentation.
 
 This library also uses the [vegetables] unit testing framework, which
 the [fpm] build system will install automatically.
@@ -75,13 +76,16 @@ emulated instrinsic procedures, which are intended for use with
 compiler versions that lack support for the named features.  Delete
 those flags with compilers that support these features.
 
-Build documentation
--------------------
+Building the documentation
+--------------------------
+After installing python and `ford` (via `pip install ford`), execute
 ```zsh
 ford doc/ford-documentation.md
 ```
+after which opening subdirectory `doc/html/index.html` in a browser.
 
 [GNU Fortran]: https://gcc.gnu.org
 [OpenCoarrays]: https://github.com/sourceryinstitute/opencoarrays
 [fpm]: https://github.com/fortran-lang/fpm
 [vegetables]: https://gitlab.com/everythingfunctional/vegetables
+[FORD]: https://github.com/Fortran-FOSS-Programmers/ford

doc/ford-documentation.md

@@ -1,6 +1,7 @@
 project:
 summary: A Fortran 2018 utility library.
 src_dir: ../src
+src_dir: ../tests
 output_dir: html
 preprocess: true
 macro: FORD