diff --git a/README.md b/README.md
index 9459592..2ac03aa 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,64 @@
-# parasoul
\ No newline at end of file
+parasoul
+============
+
+NAME
+----
+parasoul - Yet Another shell tool for executing jobs in parallel.
+
+Usage
+-----
+
+```
+USAGE:
+
+  parasoul [OPTIONS] -- [LIST] # Yet Another shell tool for executing jobs in parallel.
+
+OPTIONS:
+
+  * [-h|--help]                             # Show this help.
+  * [-v|--version]                          # Show parasoul version info.
+  * [-j|--jobs] job-count                   # Execute in parallel with `job-count`
+  * [-d|--delimiter] delimiter              # Specify list delimiter (default: [\n|\t|\s])
+  * [-e|--command] command                  # Exec command template. (require: true)
+  * [-I|--replace-token]                    # Specify replace token (default: {})
+  * [-p|--pipe]                             # Force Pipe mode. (default: false)
+  * [-s|--sequential]                       # Force Sequential mode. (force set --jobs 1)
+  * [-q|--quiet]                            # Quiet mode. (default: false)
+```
+
+Environments
+-----
+
+```
+PARASOUL_DEFAULT_LIST_DELIMITER  # Default use delimiter. (default: [\n|\t|\s])
+PARASOUL_DEFAULT_REPLACE_TOKEN   # Default use replace-token. (default: {})
+PARASOUL_DEFAULT_JOBS            # Default use job-count. (default: 2)
+PARASOUL_DEFAULT_PIPE_MODE       # Pipe mode default switch (deault: 0 (off))
+PARASOUL_DEFAULT_SEQUENTIAL_MODE # Sequential mode default switch (deault: 0 (off))
+PARASOUL_DEFAULT_QUIET_MODED     # Quiet mode default switch (deault: 0 (off))
+```
+
+Author
+
+Copyright (c) 2021 Hiroshi IKEGAMI
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/parasoul b/parasoul
index 07f39e5..51aebd0 100755
--- a/parasoul
+++ b/parasoul
@@ -19,8 +19,6 @@
 #   * [-s|--sequential]                       # Force Sequential mode. (force set --jobs 1)
 #   * [-q|--quiet]                            # Quiet mode. (default: false)
 #
-# HELP
-#
 # MIT License
 #
 # Copyright (c) 2021 Hiroshi IKEGAMI
diff --git a/parasoul.1 b/parasoul.1
new file mode 100644
index 0000000..460c6e0
--- /dev/null
+++ b/parasoul.1
@@ -0,0 +1,91 @@
+.TH "PARASOUL" "1"
+.nh
+.SH NAME
+.PP
+parasoul - Yet Another shell tool for executing jobs in parallel.
+
+.SH Usage
+.PP
+.RS
+
+.nf
+USAGE:
+
+  parasoul [OPTIONS] -- [LIST] # Yet Another shell tool for executing jobs in parallel.
+
+OPTIONS:
+
+  * [-h|--help]                             # Show this help.
+  * [-v|--version]                          # Show parasoul version info.
+  * [-j|--jobs] job-count                   # Execute in parallel with `job-count`
+  * [-d|--delimiter] delimiter              # Specify list delimiter (default: [\\n|\\t|\\s])
+  * [-e|--command] command                  # Exec command template. (require: true)
+  * [-I|--replace-token]                    # Specify replace token (default: {})
+  * [-p|--pipe]                             # Force Pipe mode. (default: false)
+  * [-s|--sequential]                       # Force Sequential mode. (force set --jobs 1)
+  * [-q|--quiet]                            # Quiet mode. (default: false)
+
+.fi
+.RE
+
+.SH Environments
+.PP
+.RS
+
+.nf
+PARASOUL_DEFAULT_LIST_DELIMITER  # Default use delimiter. (default: [\\n|\\t|\\s])
+PARASOUL_DEFAULT_REPLACE_TOKEN   # Default use replace-token. (default: {})
+PARASOUL_DEFAULT_JOBS            # Default use job-count. (default: 2)
+PARASOUL_DEFAULT_PIPE_MODE       # Pipe mode default switch (deault: 0 (off))
+PARASOUL_DEFAULT_SEQUENTIAL_MODE # Sequential mode default switch (deault: 0 (off))
+PARASOUL_DEFAULT_QUIET_MODED     # Quiet mode default switch (deault: 0 (off))
+
+.fi
+.RE
+
+.PP
+Author
+
+.PP
+Copyright (c) 2021 Hiroshi IKEGAMI
+
+.PP
+MIT License
+
+.PP
+Permission is hereby granted, free of charge, to any person obtaining
+.br
+a copy of this software and associated documentation files (the
+.br
+"Software"), to deal in the Software without restriction, including
+.br
+without limitation the rights to use, copy, modify, merge, publish,
+.br
+distribute, sublicense, and/or sell copies of the Software, and to
+.br
+permit persons to whom the Software is furnished to do so, subject to
+.br
+the following conditions:
+.br
+
+.PP
+The above copyright notice and this permission notice shall be
+.br
+included in all copies or substantial portions of the Software.
+.br
+
+.PP
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+.br
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.br
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+.br
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+.br
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+.br
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+.br
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+.br