diff --git a/authors.txt b/authors.txt
new file mode 100644
--- /dev/null
+++ b/authors.txt
@@ -0,0 +1,24 @@
+(in alphabetical order)
+
+Michał Antkiewi
+Francesco Ariis
+Dmitry Bogatov
+Damien Couroussé
+Ben Franksen
+Artyom Kazak
+Anton Felix Lorenzen
+Rodney Lorrimar
+Francesco Mazzoli
+Eric Mertens
+Simon Michael
+Luca Molteni
+Luke Murphy
+Qptain Nemo
+Mats Rauhala
+Stefano Rodighiero
+Peter Simons
+Henning Thielemann
+Tomislav
+Tuncer Ayaz
+YongJoon Joe
+Massimo Zaniboni
diff --git a/changes.txt b/changes.txt
--- a/changes.txt
+++ b/changes.txt
@@ -1,3 +1,10 @@
+1.5.9.0
+-------
+
+- Added support for Scheme (`.scm`, `.ss`) and Lisp (`.lisp`, `.lsp`,
+  `.l`, `.cl`, `.fasl`) languages (thanks to Christoph Breitkopf for
+  providing relevant documentation).
+
 1.5.8.0
 -------
 
diff --git a/doc/usr/page.rst b/doc/usr/page.rst
--- a/doc/usr/page.rst
+++ b/doc/usr/page.rst
@@ -192,6 +192,8 @@
 - YAML files (``.yaml``, ``.yml``)
 - LaTeX files (``.tex``)
 - Zig files (``.zig``)
+- Scheme files (``.scm``, ``.ss``)
+- Lisp files (``.lisp``, ``.lsp``, ``.l``, ``.cl``, ``.fasl``)
 - plain text files (``.txt``)
 
 If you want a file type ``.xyz`` to be recognised as one in the list above,
diff --git a/lentil.cabal b/lentil.cabal
--- a/lentil.cabal
+++ b/lentil.cabal
@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                lentil
-version:             1.5.8.0
+version:             1.5.9.0
 synopsis:            frugal issue tracker
 description:         minumum effort, cohesive issue tracker based on
                      ubiquitous @TODO@s and @FIXME@s conventions.
@@ -58,7 +58,8 @@
                      test/test-files/test-proj/upper/prova2.cPp,
                      test/test-files/test-proj/upper/prova3.Cpp,
                      test/test-files/test-proj/upper/prova.F
-extra-doc-files:     README, changes.txt, doc/usr/page.rst, doc/usr/test.zip
+extra-doc-files:     README, changes.txt, doc/usr/page.rst, doc/usr/test.zip,
+                     authors.txt
 
 flag developer
   description: developer mode - warnings let compilation fail
@@ -68,7 +69,7 @@
 
 executable lentil
   main-is:             Main.hs
-  build-depends:       base >= 4.9 && < 5.0,
+  build-depends:       base == 4.*,
                        bytestring == 0.12.*,
                        prettyprinter == 1.7.*,
                        prettyprinter-ansi-terminal >= 1.1.3 && < 1.2,
@@ -78,10 +79,10 @@
                        directory    >= 1.2 && < 1.4,
                        filemanip==0.3.*,
                        filepath >=1.4 && <1.6,
-                       megaparsec >= 8.0 && < 9.7,
+                       megaparsec >= 8.0 && < 9.8,
                        mtl >=2.2 && <2.4,
                        natural-sort==0.1.*,
-                       optparse-applicative >= 0.16 && < 0.19,
+                       optparse-applicative >= 0.16 && < 0.20,
                        regex-tdfa >= 1.2 && < 1.4,
                        semigroups >= 0.18 && < 0.21,
                        text >=1.2 && <2.2,
@@ -116,10 +117,10 @@
                        dlist >= 0.8 && < 1.1,
                        filemanip==0.3.*,
                        filepath >=1.4 && <1.6,
-                       megaparsec >= 8.0 && < 9.7,
+                       megaparsec >= 8.0 && < 9.8,
                        mtl >=2.2 && <2.4,
                        natural-sort==0.1.*,
-                       optparse-applicative >= 0.16 && < 0.19,
+                       optparse-applicative >= 0.16 && < 0.20,
                        regex-tdfa >= 1.2 && < 1.4,
                        semigroups >= 0.18 && < 0.21,
                        text >=1.2 && <2.2,
diff --git a/src/Lentil/Parse/Syntaxes.hs b/src/Lentil/Parse/Syntaxes.hs
--- a/src/Lentil/Parse/Syntaxes.hs
+++ b/src/Lentil/Parse/Syntaxes.hs
@@ -81,10 +81,14 @@
               ([".fs", ".fth", ".4th"], Just forth), -- forth
               ([".yaml", ".yml"],       Just perl), -- YAML
               ([".tex"],                Just latex), -- LaTeX, TeX
+              ([".scm", ".ss"],         Just scheme), -- Scheme
+              ([".lisp", ".lsp", ".l",
+                ".cl", ".fasl"],        Just scheme), -- Lisp
               ([".txt", ".md"],         Just text) ]
 
 haskell, c, zig, javascript, pascal, python, ruby, perl, nix,
     xml, erlang, ocaml, rp, rust, sml, forth, rst, org, latex,
+    scheme,
     text :: ParSource [CommentString]
 haskell    = source $ StdSyntax ["--"] [("{-", "-}")]
                                 ClangLike ['"'] CommonChr ['\'']
@@ -127,6 +131,8 @@
                                 , "%" -- single-line comments
                                 ]
                                 [] -- Some packages provide support for multi-line comments, but there is no support for multi-line comments, even if some packages provide support for.
+                                ClangLike ['"'] CommonChr []
+scheme     = source $ StdSyntax [";"] []
                                 ClangLike ['"'] CommonChr []
 text       = (:[]) . MultiLine 1 <$> many anySingle
 
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -15,6 +15,7 @@
 -- todo [feature:basic] help su `lentil` più semplie (`use lentil .`)
 -- todo [design] lentil con lexer?
 -- todo [feature:basic] lentil <-- invoke with lentil . or lentil --help
+-- todo [feature:basic] add groff syntax
 
 main :: IO ()
 main = I.hSetBuffering I.stderr I.NoBuffering >> -- b/c progress bar
@@ -44,7 +45,7 @@
                                    short 'v'      S.<>
                                    help "show version and copyright info" )
     where
-          versionCopy = "\nlentil - frugal issue tracker, version 1.5.8.0\n\
+          versionCopy = "\nlentil - frugal issue tracker, version 1.5.9.0\n\
                         \(C) 2015-2024 Francesco Ariis - http://www.ariis.it\n\
                         \released under the GNU General Public License v3\n"
 
diff --git a/test/Lentil/Parse/RunSpec.hs b/test/Lentil/Parse/RunSpec.hs
--- a/test/Lentil/Parse/RunSpec.hs
+++ b/test/Lentil/Parse/RunSpec.hs
@@ -51,6 +51,7 @@
             `shouldReturn` [Issue "test/test-files/specific/latin1.c" 1
                                   (Just "single") []]
 
+  -- TODO Abstract spt [refactor].
   describe "commentParser - languages" $ do
     it "parses a plain text source" $
         fileParser [] [] "test/test-files/lang-comm/text.txt"
@@ -120,3 +121,6 @@
     it "parses a Zig source" $
         fileParser [] [] "test/test-files/lang-comm/zig.zig"
             `shouldReturn` spt "test/test-files/lang-comm/zig.zig"
+    it "parses a Scheme/Lisp source" $
+        fileParser [] [] "test/test-files/lang-comm/scheme.scm"
+            `shouldReturn` spt "test/test-files/lang-comm/scheme.scm"