diff --git a/.github/scripts/update-version.sh b/.github/scripts/update-version.sh
index 91848c9..4b41309 100755
--- a/.github/scripts/update-version.sh
+++ b/.github/scripts/update-version.sh
@@ -33,7 +33,7 @@ fi
 
 # Update latest version
 sed -i "s/_version:.*$/_version: '${LATEST_VERSION}'/" 'defaults/main.yml'
-sed -i "s/${CURRENT_VERSION}/${LATEST_VERSION}/" 'README.md'
+yq eval -i ".argument_specs.main.options.jira_version.default = \"${LATEST_VERSION}\"" 'meta/argument_specs.yml'
 
 # Repository variables
 REPO_NAME=$(git config --get remote.origin.url | sed -e 's|^https://github.com/||')
@@ -49,7 +49,7 @@ if [ "${REMOTE_BRANCH}" == null ] ; then
     git checkout -b "${UPDATE_VERSION_BRANCH}"
 
     # Push new version
-    git add defaults/main.yml README.md
+    git add defaults/main.yml meta/argument_specs.yml
     git commit --signoff -m "${UPDATE_VERSION_COMMIT}"
 
     echo -e "${GREEN}Pushing to ${UPDATE_VERSION_BRANCH} branch.${NO_COLOR}"
diff --git a/README.md b/README.md
index 8f2bcc2..9106640 100644
--- a/README.md
+++ b/README.md
@@ -24,34 +24,9 @@ Requirements
 Role Variables
 --------------
 
-- `jira_product` Jira product. Available values are: `software` (default), `core`.
-- `jira_version` The version of Jira to download (default: `9.12.11`).
-- `jira_archive_name` Jira archive name (default: `atlassian-jira-software-9.12.11.tar.gz`).
-- `jira_download_url` URL to download the Jira archive (default: `https://www.atlassian.com/software/jira/downloads/binary`).
-- `jira_checksum_url` The Jira checksum file URL (default: `{{ jira_download_url }}/{{ jira_archive_name }}.sha256`).
-- `jira_download_path` Local path to download and extract the archive (default: `/tmp`).
-- `jira_user` and `jira_group` System user and group that will be created (default: `jira`).
-- `jira_root_path` The Jira installation directory (default: `/opt/atlassian/jira`).
-- `jira_home_path` The Jira home directory (default: `/var/atlassian/application-data/jira`).
-- `jira_min_nofiles_limit` If the limit of files that Jira can open is too low, it will be set to this value (default: `16384`).
-- `jira_jvm_support_recommends_args` Occasionally Atlassian Support may recommend that you set some specific JVM arguments (default: `null`).
-- `jira_jvm_gc_args` You can use variable below to modify garbage collector settings (default: `-XX:+ExplicitGCInvokesConcurrent`).
-- `jira_jvm_minimum_memory` and `jira_jvm_maximum_memory` The minimum and maximum size of the heap (default: `384m` and `2048m`).
-- `jira_jvm_initial_code_cache_size` and `jira_jvm_reserved_code_cache_size` The size of JVM code cache (default: `32m` and `512m`). A high value of reserved size allows Jira to work with more installed apps.
-- `jira_jvm_required_args` The following are the required arguments for Jira.
-- `jira_db_configuration` DB connection configuration (default: `false`).
-- `jira_db_address` Hostname or IP address of your database server.
-- `jira_db_port` TCP port number for your database server.
-- `jira_db_name` DB name.
-- `jira_db_username` and `jira_db_password` Database username and password to be passed to the JDBC driver.
-- `jira_catalina_connector_proxyname` Fqdn server name. If you don't use a reverse proxy, then you'll need to leave this variable without value.
-- `jira_catalina_connector_scheme` Connection scheme. Available values are: `http` (default), `https`.
-
-    **Attention** If you use `https` value, you'll need to install SSL sertificate on server with reverse proxy.
-
-- `jira_catalina_connector_proxyport` Server port (default: `80` or `443`).
-  - `80` sets automatically if value in `jira_catalina_connector_scheme` is `http`.
-  - `443` sets automatically if value in `jira_catalina_connector_scheme` is `https`.
+All variables that can be overridden are stored in the [defaults/main.yml](https://github.com/antmelekhin/ansible-role-jira/blob/main/defaults/main.yml) file.
+Please refer to the [meta/argument_specs.yml](https://github.com/antmelekhin/ansible-role-jira/blob/main/meta/argument_specs.yml) file for a description of the available variables.
+Similarly, descriptions and defaults for preset variables can be found in the [vars/main.yml](https://github.com/antmelekhin/ansible-role-jira/blob/main/vars/main.yml) file.
 
 Dependencies
 ------------
diff --git a/defaults/main.yml b/defaults/main.yml
index 361dac5..3a262e7 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -34,4 +34,4 @@ jira_db_password: ''
 # The Jira proxy settings
 jira_catalina_connector_proxyname: ''
 jira_catalina_connector_scheme: 'http'
-jira_catalina_connector_proxyport: '{{ (jira_catalina_connector_scheme | lower == "http") | ternary("80", "443") }}'
+jira_catalina_connector_proxyport: "{{ (jira_catalina_connector_scheme | lower == 'http') | ternary('80', '443') }}"
diff --git a/meta/argument_specs.yml b/meta/argument_specs.yml
new file mode 100644
index 0000000..951b71b
--- /dev/null
+++ b/meta/argument_specs.yml
@@ -0,0 +1,117 @@
+---
+argument_specs:
+  main:
+    short_description: 'Jira'
+    description:
+      - 'An Ansible role to install, configure and update L(Jira,https://www.atlassian.com/ru/software/jira).'
+    author:
+      - 'Melekhin Anton'
+    options:
+      jira_product:
+        type: 'str'
+        description: 'Jira product.'
+        choices:
+          - 'core'
+          - 'software'
+        default: 'software'
+      jira_version:
+        type: 'str'
+        description: 'The version of Jira to download.'
+        default: '9.12.11'
+      jira_archive_name:
+        type: 'str'
+        description: 'Jira archive name.'
+        default: 'atlassian-jira-{{ jira_product }}-{{ jira_version }}.tar.gz'
+      jira_download_url:
+        type: 'str'
+        description: 'URL to download the Jira archive.'
+        default: 'https://www.atlassian.com/software/jira/downloads/binary'
+      jira_checksum_url:
+        type: 'str'
+        description: 'The Jira checksum file URL.'
+        default: '{{ jira_download_url }}/{{ jira_archive_name }}.sha256'
+      jira_download_path:
+        type: 'path'
+        description: 'Local path to download and extract the archive.'
+        default: '/tmp'
+      jira_user:
+        type: 'str'
+        description: 'System user that will be created.'
+        default: 'jira'
+      jira_group:
+        type: 'str'
+        description: 'System group that will be created.'
+        default: '{{ jira_user }}'
+      jira_root_path:
+        type: 'path'
+        description: 'The Jira installation directory.'
+        default: '/opt/atlassian/jira'
+      jira_home_path:
+        type: 'path'
+        description: 'The Jira home directory.'
+        default: '/var/atlassian/application-data/jira'
+      jira_min_nofiles_limit:
+        type: 'int'
+        description: 'If the limit of files that Jira can open is too low, it will be set to this value.'
+        default: 16384
+      jira_jvm_support_recommends_args:
+        type: 'str'
+        description: 'Occasionally Atlassian Support may recommend that you set some specific JVM arguments.'
+      jira_jvm_gc_args:
+        type: 'str'
+        description: 'You can use variable below to modify garbage collector settings.'
+        default: '-XX:+ExplicitGCInvokesConcurrent'
+      jira_jvm_minimum_memory:
+        type: 'str'
+        description: 'The minimum size of the heap.'
+        default: '384m'
+      jira_jvm_maximum_memory:
+        type: 'str'
+        description: 'The maximum size of the heap.'
+        default: '2048m'
+      jira_jvm_initial_code_cache_size:
+        type: 'str'
+        description: 'The size of JVM code cache.'
+        default: '32m'
+      jira_jvm_reserved_code_cache_size:
+        type: 'str'
+        description: 'The size of JVM code cache. A high value of reserved size allows Jira to work with more installed apps.'
+        default: '512m'
+      jira_db_configuration:
+        type: 'bool'
+        description: 'DB connection configuration.'
+        default: false
+      jira_db_host:
+        type: 'str'
+        description: 'Hostname or IP address of your database server.'
+      jira_db_port:
+        type: 'str'
+        description: 'TCP port number for your database server.'
+      jira_db_name:
+        type: 'str'
+        description: 'DB name.'
+      jira_db_username:
+        type: 'str'
+        description: 'Database username to be passed to the JDBC driver.'
+      jira_db_password:
+        type: 'str'
+        description: 'Database password to be passed to the JDBC driver.'
+      jira_catalina_connector_proxyname:
+        type: 'str'
+        description: "Fqdn server name. If you don't use a reverse proxy, then you'll need to leave this variable without value."
+      jira_catalina_connector_scheme:
+        type: 'str'
+        description:
+          - 'Connection scheme.'
+          - "If you use C(https) value, you'll need to install SSL sertificate on server with reverse proxy."
+        choices:
+          - 'http'
+          - 'https'
+        default: 'http'
+      jira_catalina_connector_proxyport:
+        type: 'int'
+        description:
+          - 'Server port.'
+          - '80 port sets automatically if value in C(jira_catalina_connector_scheme) variable is C(http).'
+          - '443 port sets automatically if value in C(jira_catalina_connector_scheme) variable is C(https).'
+        default: "{{ (jira_catalina_connector_scheme | lower == 'http') | ternary('80', '443') }}"