diff --git a/README.md b/README.md
index 7920cd4..d7585cb 100644
--- a/README.md
+++ b/README.md
@@ -49,23 +49,27 @@ console.log(process.env.TIMESTAMP); // '1588558255810'
 ```
 
 ## Generate current date and time
-Sometimes you need to generate current date and time. It can easily be done like
-this:
+Sometimes you need to generate current date and time. It can easily be done with `generateDateTime` function:
 ```
 const { dateTime } = require('js-automation-tools');
 
 const currentDateTime = dateTime.generateDateTime(); // '2024-09-23T19:26:35'
+```
+Also you can use a `generateDateTimePlus` function that generates current (if no initial date is provided) date and time plus number of days, hours, minutes, seconds if they are provided. This function accepts configuration object with 5 arguments:
+1. `days` - number of days that will be added to current (if no initial date is provided) date and time (optional, default value: `0`).
+2. `hours` - number of hours that will be added to current (if no initial date is provided) date and time (optional, default value: `0`).
+3. `minutes` - number of minutes that will be added to current (if no initial date is provided) date and time (optional, default value: `0`).
+4. `seconds` - number of seconds that will be added to current (if no initial date is provided) date and time (optional, default value: `0`).
+5. `initialDate` - string with initial date and time that you want to add a number of days, hours, minutes, seconds to (for example: '2024-03-14T00:14:25', optional, default value: current date and time).
+```
+const { dateTime } = require('js-automation-tools');
+
 const currentDateTimePlusDay = dateTime.generateDateTimePlus({ days: 1 }); // '2024-09-24T19:26:35'
 const currentDateTimePlusHour = dateTime.generateDateTimePlus({ hours: 1 }); // '2024-09-23T20:26:35'
 const currentDateTimePlusMinute = dateTime.generateDateTimePlus({ minutes: 1 }); // '2024-09-23T19:27:35'
 const currentDateTimePlusSecond = dateTime.generateDateTimePlus({ seconds: 1 }); // '2024-09-23T19:26:36'
 
 const currentDateTimeMinusHour = dateTime.generateDateTimePlus({ hours: -1 }); // '2024-09-23T18:26:35'
-```
-Also you can call these functions with an optional initial date - to add
-days/hours/minutes/seconds to that date:
-```
-const { dateTime } = require('js-automation-tools');
 
 const pastDateTimePlusDay = dateTime.generateDateTimePlus({ days: 1, initialDate: '2024-03-14T00:14:25' }); // '2024-03-15T00:14:25'
 const pastDateTimePlusHour = dateTime.generateDateTimePlus({ hours: 1, initialDate: '2024-03-14T00:14:25' }); // '2024-03-14T01:14:25'
@@ -89,9 +93,9 @@ Send request to any URL and get response - `sendRequest` function accepts
 configuration object with 5 arguments:
 1. `method` - string (for example: `'GET'` or `'POST'` or `'DELETE'` or any other).
 2. `requestUrl` - string with URL of endpoint to send request to (for example: `'https://www.google.com/'`).
-3. `headersString` - string that contains request headers (for example: `'{ "Content-Type": "application/json", "Authorization": "Bearer aBcD1234" }'`).
-4. `bodyString` - string that contains request body (for example: `'{ "test1": 1, "test2": 2 }'`).
-5. `logLevel` - number (for example: `0` or `1` or `2`, default value: `0` - no logs).
+3. `headersString` - string that contains request headers (for example: `'{ "Content-Type": "application/json", "Authorization": "Bearer aBcD1234" }'`, optional).
+4. `bodyString` - string that contains request body (for example: `'{ "test1": 1, "test2": 2 }'`, optional).
+5. `logLevel` - number (for example: `0` or `1` or `2`, optional, default value: `0` - no logs).
 
 Also you can just call `sendRequest` function without `headersString`,
 `bodyString`, `logLevel` arguments if they are not needed - for example in GET
@@ -138,10 +142,10 @@ check will be `true` or the amount of provided attempts will be exceeded -
     ```
 2. `functionCheck` - function to execute to check the result of
     `functionToExecute` (if successful - should return `true`, for example:
-    `(responseBody) => responseBody.length > 0`).
-3. `attempts` - number of attempts to retry (default value: `10`).
-4. `waitTime` - time to wait between retries (in milliseconds, default value: `1000`).
-5. `logLevel` - number (for example: `0` or `1` or `2`, default value: `0` - no logs).
+    `(responseBody) => responseBody.length > 0`, optional).
+3. `attempts` - number of attempts to retry (optional, default value: `10`).
+4. `waitTime` - time to wait between retries in milliseconds (optional, default value: `1000`).
+5. `logLevel` - number (for example: `0` or `1` or `2`, optional, default value: `0` - no logs).
 
 > Note: you have to specify the `retryIfFalse` arguments inside the
 > configuration object as `key: value` pairs:
diff --git a/utils/retry.js b/utils/retry.js
index 3b5f805..0ece6c5 100644
--- a/utils/retry.js
+++ b/utils/retry.js
@@ -21,10 +21,10 @@ const ERROR_FAILED_FUNCTION_TO_EXECUTE = '\n-> Provided number of attempts was e
  * (`functionCheck`) check will be `true` or the amount of provided attempts (`attempts`) will be exceeded.
  * @param {Object} configurationObject configuration object with parameters, for example: `{ functionToExecute: myFunction, functionCheck: checkFunction, attempts: 20, waitTime: 5000, logLevel: 2 }`.
  * @param {Function} configurationObject.functionToExecute function to execute (for example an API request).
- * @param {Function|_returnResult} configurationObject.functionCheck function to execute to check the result of `functionToExecute` (if successful - should return `true`, for example: `(responseBody) => responseBody.length > 0`).
- * @param {Number|_attemptsDefault} configurationObject.attempts number of attempts to retry (default value: `10`).
- * @param {Number|_waitTimeDefault} configurationObject.waitTime time to wait between retries (in milliseconds, default value: `1000`).
- * @param {Number|_logLevelDefault} configurationObject.logLevel number (for example: `0` or `1` or `2`, default value: `0` - no logs).
+ * @param {Function=} configurationObject.functionCheck function to execute to check the result of `functionToExecute` (if successful - should return `true`, for example: `(responseBody) => responseBody.length > 0`, optional).
+ * @param {Number=} configurationObject.attempts number of attempts to retry (optional, default value: `10`).
+ * @param {Number=} configurationObject.waitTime time to wait between retries in milliseconds (optional, default value: `1000`).
+ * @param {Number=} configurationObject.logLevel number (for example: `0` or `1` or `2`, optional, default value: `0` - no logs).
  * @returns {Promise} response of a function that was provided for execution.
  */
 async function retryIfFalse ({
diff --git a/utils/send-request.js b/utils/send-request.js
index 398297c..295b046 100644
--- a/utils/send-request.js
+++ b/utils/send-request.js
@@ -51,9 +51,9 @@ function _handleResponse (response, logLevel, callbackFunction) {
  * @param {Object} configurationObject configuration object with parameters, for example: `{ method: 'POST', requestUrl: 'http://httpbin.org/post', headersString: '{ "Content-Type": "application/json", "Authorization": "Bearer aBcD1234" }', bodyString: '{ "test1": 1, "test2": 2 }', logLevel: 1 }`.
  * @param {String} configurationObject.method string with method `'GET'` or `'POST'` or `'DELETE'` or any other.
  * @param {String} configurationObject.requestUrl string with URL of endpoint to send request to (for example: `'https://www.google.com/'`).
- * @param {String|_emptyString} configurationObject.headersString string that contains request headers (for example: `'{ "Content-Type": "application/json", "Authorization": "Bearer aBcD1234" }'`).
- * @param {String|_emptyString} configurationObject.bodyString string that contains request body (for example: `'{ "test1": 1, "test2": 2 }'`).
- * @param {Number|_logLevelDefault} configurationObject.logLevel number (for example: `0` or `1` or `2`, default value: `0` - no logs).
+ * @param {String=} configurationObject.headersString string that contains request headers (for example: `'{ "Content-Type": "application/json", "Authorization": "Bearer aBcD1234" }'`, optional).
+ * @param {String=} configurationObject.bodyString string that contains request body (for example: `'{ "test1": 1, "test2": 2 }'`, optional).
+ * @param {Number=} configurationObject.logLevel number (for example: `0` or `1` or `2`, optional, default value: `0` - no logs).
  * @returns {Promise} response from endpoint. Resolves into an object with `statusCode`, `headers`, `body`.
  */
 function sendRequest ({