diff --git a/.gitignore b/.gitignore
index f720e08..7136ba0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ coverage.xml
 build
 dist
 .pytest_cache
+words.txt
diff --git a/README.md b/README.md
index a173189..bb3a031 100644
--- a/README.md
+++ b/README.md
@@ -23,15 +23,18 @@ uvx --from git+https://git.klemek.fr/klemek/cool-domain cool-domain
 ## Usage
 
 ```txt
-usage: cool-domain [-h] [--count DOMAIN_COUNT] [--lang {english,french}] [--words WORD_COUNT] [--dig | --no-dig] [--debug | --no-debug]
-                   [--quiet | --no-quiet] [--cache | --no-cache] [--cache-file CACHE_FILE] [--tld-list-uri TLD_LIST_URI]
+usage: cool-domain [-h] [--count DOMAIN_COUNT] [--words WORD_COUNT] [--lang {english,french,custom}] [--custom-words CUSTOM_WORDS]
+                   [--dig | --no-dig] [--debug | --no-debug] [--quiet | --no-quiet] [--cache | --no-cache] [--cache-file CACHE_FILE]
+                   [--tld-list-uri TLD_LIST_URI]
 
 options:
   -h, --help            show this help message and exit
   --count DOMAIN_COUNT  number of domains to generate (default: 1)
-  --lang {english,french}
-                        word list lang (default: english)
   --words WORD_COUNT    number of words per domain (default: 1)
+  --lang {english,french,custom}
+                        word list lang (default: english)
+  --custom-words CUSTOM_WORDS
+                        custom word list location (default: words.txt)
   --dig, --no-dig       check availability with dig (default: true)
   --debug, --no-debug
   --quiet, --no-quiet
diff --git a/cool_domain/__main__.py b/cool_domain/__main__.py
index 4ac3d49..d0638bd 100644
--- a/cool_domain/__main__.py
+++ b/cool_domain/__main__.py
@@ -1,6 +1,8 @@
 import logging
 import sys
 
+from cool_domain.word_list import WordList
+
 from . import PKG_NAME, PKG_VERSION
 from .cache import Cache
 from .constants import LANGS
@@ -14,10 +16,12 @@ def main() -> int:
     params = parse_parameters(sys.argv[1:])
     setup_logs(params)
     logging.getLogger().info("%s %s", PKG_NAME, PKG_VERSION)
+    langs = LANGS
+    langs["custom"] = WordList("custom", params.custom_words)
     with (
         Cache(filepath=params.cache_file, no_load=params.cache) as cache,
         TLDList(cache=cache, remote_uri=params.tld_list_uri) as tld_list,
-        LANGS[params.lang] as word_list,
+        langs[params.lang] as word_list,
     ):
         factory = Factory(tld_list=tld_list, word_list=word_list, words=params.words)
         logging.getLogger().info(
diff --git a/cool_domain/constants.py b/cool_domain/constants.py
index 4ededee..a163c2d 100644
--- a/cool_domain/constants.py
+++ b/cool_domain/constants.py
@@ -1,6 +1,6 @@
 from .word_list import WordList
 
 LANGS: dict[str, WordList] = {
-    "english": WordList("english", "english", "words_alpha.txt"),
-    "french": WordList("french", "french", "francais.txt"),
+    "english": WordList("english", "english/words_alpha.txt"),
+    "french": WordList("french", "french/francais.txt"),
 }
diff --git a/cool_domain/params.py b/cool_domain/params.py
index 2aeec8d..e1fa622 100644
--- a/cool_domain/params.py
+++ b/cool_domain/params.py
@@ -20,6 +20,7 @@ class Parameters:
     lang: str = "english"
     cache_file: str = str(pathlib.Path(tempfile.gettempdir()) / ".cool-domain-cache")
     tld_list_uri: str = "https://publicsuffix.org/list/public_suffix_list.dat"
+    custom_words: str = "words.txt"
 
     @classmethod
     def from_namespace(cls, args: argparse.Namespace) -> "Parameters":
@@ -98,12 +99,6 @@ def parse_parameters(args: typing.Sequence[str]) -> Parameters:
         default=default_values.count,
         help_txt="number of domains to generate",
     )
-    parser.add_argument(
-        "--lang",
-        default=default_values.lang,
-        help="word list lang (default: english)",
-        choices=LANGS.keys(),
-    )
     __add_arg_int(
         parser,
         "--words",
@@ -111,6 +106,19 @@ def parse_parameters(args: typing.Sequence[str]) -> Parameters:
         default=default_values.words,
         help_txt="number of words per domain",
     )
+    parser.add_argument(
+        "--lang",
+        default=default_values.lang,
+        help="word list lang (default: english)",
+        choices=[*list(LANGS.keys()), "custom"],
+    )
+    __add_arg_str(
+        parser,
+        "--custom-words",
+        env_var="CUSTOM_WORDS",
+        default=default_values.custom_words,
+        help_txt="custom word list location",
+    )
     __add_arg_bool(
         parser,
         "--dig",
diff --git a/cool_domain/word_list.py b/cool_domain/word_list.py
index 58c8e87..b766434 100644
--- a/cool_domain/word_list.py
+++ b/cool_domain/word_list.py
@@ -8,10 +8,10 @@ import unidecode
 class WordList:
     __slots__ = ["__filepath", "__name", "logger", "words"]
 
-    def __init__(self, name: str, path: str, filename: str) -> None:
+    def __init__(self, name: str, path: str) -> None:
         self.logger: logging.Logger = logging.getLogger(self.__class__.__name__)
         self.__name = name
-        self.__filepath = pathlib.Path(__file__).parent / ".." / path / filename
+        self.__filepath = pathlib.Path(__file__).parent / ".." / path
         self.words: list[str] = []
 
     def open(self) -> None: