diff --git a/changes.txt b/changes.txt
--- a/changes.txt
+++ b/changes.txt
@@ -1,3 +1,9 @@
+1.5.1.0
+-------
+
+- Fri 05 Mar 2021 22:41:35 CET
+- Add Forth syntax
+
 1.5.0.0
 -------
 
diff --git a/doc/usr/page.rst b/doc/usr/page.rst
--- a/doc/usr/page.rst
+++ b/doc/usr/page.rst
@@ -183,6 +183,7 @@
 - Org mode for Emacs files (``.org``), both ``TODO`` and list-like items
 - Markdown files (``.md``)
 - R files (``.r``, ``.R``)
+- Forth files (``.fs``, ``.fth``, ``.4th``)
 - plain text files (``.txt``)
 
 If you want a file type ``.xyz`` to be recognised as one in the list above,
@@ -295,7 +296,7 @@
 This is useful because it is recognised by editors like Emacs,
 which can turn them into active links to the relevant file/position.
 
-``-f file`` exports a filelist.
+``-f file`` exports a list of files where issues are present:
 
 ::
 
diff --git a/issues.txt b/issues.txt
--- a/issues.txt
+++ b/issues.txt
@@ -7,6 +7,10 @@
     13  Henning: don't output nothing on lentil xxx.cabal (maybe add 19
         skipped?) [request] [2017]
  
+src/Lentil/Export.hs
+    54  markdown output - che genere di header? o lista di liste? - come
+        mettere i tag? /[[cdsacad] [feature] [u:3] [cdsac]
+ 
 src/Lentil/File.hs
     69  combine funziona su windows? [test]
  
@@ -23,7 +27,7 @@
         [request]
     36  Consider using https://github.com/github/semantic ? [design]
     45  lowercase does not work (not recognised, .r vs. .R) [bug]
-   115  rst parser doesn't respect whitespace or paragraphs. How to
+   118  rst parser doesn't respect whitespace or paragraphs. How to
         implement this without breaking other parsers? [bug] [design]
  
 src/Main.hs
diff --git a/lentil.cabal b/lentil.cabal
--- a/lentil.cabal
+++ b/lentil.cabal
@@ -1,5 +1,5 @@
 name:                lentil
-version:             1.5.0.0
+version:             1.5.1.0
 synopsis:            frugal issue tracker
 description:         minumum effort, cohesive issue tracker based on
                      ubiquitous @TODO@s and @FIXME@s conventions.
@@ -18,6 +18,7 @@
 tested-with:         GHC==8.4.1, GHC==8.6.1, GHC==8.8.3
 extra-source-files:  stack.yaml,
                      test/test-files/lang-comm/clang.c,
+                     test/test-files/lang-comm/forth.fs,
                      test/test-files/lang-comm/haskell.hs,
                      test/test-files/lang-comm/javascript.js,
                      test/test-files/lang-comm/out.blocks,
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
@@ -78,10 +78,11 @@
               ([".rst"],                Just rst), -- reStructuredText
               ([".org"],                Just org), -- org-mode
               ([".r"],                  Just rp), -- R language
+              ([".fs", ".fth", ".4th"], Just forth), -- forth
               ([".txt", ".md"],         Just text) ]
 
 haskell, c, javascript, pascal, python, ruby, perl, nix,
-    xml, erlang, ocaml, rp, rust, sml, rst, org,
+    xml, erlang, ocaml, rp, rust, sml, forth, rst, org,
     text :: ParSource [CommentString]
 haskell    = source $ StdSyntax ["--"] [("{-", "-}")]
                                 ClangLike ['"'] CommonChr ['\'']
@@ -110,6 +111,8 @@
 rust       = source $ StdSyntax ["//!", "///", "//"] []
                                 ClangLike ['"', '\''] CommonChr []
 sml        = source $ StdSyntax [] [("(*", "*)")]
+                                ClangLike ['"'] CommonChr []
+forth      = source $ StdSyntax ["\\"] [("( ", ")")]
                                 ClangLike ['"'] CommonChr []
 rst        = source RstSyntax
              -- todo [bug] [design] rst parser doesn't respect whitespace or
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -37,7 +37,7 @@
                                    short 'v'      S.<>
                                    help "show version and copyright info" )
     where
-          versionCopy = "\nlentil - frugal issue tracker, version 1.5.0.0\n\
+          versionCopy = "\nlentil - frugal issue tracker, version 1.5.1.0\n\
                         \(C) 2015-2021 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
@@ -106,4 +106,7 @@
     it "parses an R source" $
         fileParser [] [] "test/test-files/lang-comm/r.r"
             `shouldReturn` spt "test/test-files/lang-comm/r.r"
+    it "parses a Forth source" $
+        fileParser [] [] "test/test-files/lang-comm/forth.fs"
+            `shouldReturn` spt "test/test-files/lang-comm/forth.fs"
 
diff --git a/test/test-files/lang-comm/forth.fs b/test/test-files/lang-comm/forth.fs
new file mode 100644
--- /dev/null
+++ b/test/test-files/lang-comm/forth.fs
@@ -0,0 +1,9 @@
+\ TODO: single
+\    comment 
+( todo single2 )
+
+: myword ." ( "
+do myChar s" \n" ( toast )
+
+\  todo block1
+(  todo block2 [tog]  )