diff --git a/modules/core/include/opencv2/core/utility.hpp b/modules/core/include/opencv2/core/utility.hpp
index db8c42976f..e491352bcf 100644
--- a/modules/core/include/opencv2/core/utility.hpp
+++ b/modules/core/include/opencv2/core/utility.hpp
@@ -773,7 +773,7 @@ The sample below demonstrates how to use CommandLineParser:
 The keys parameter is a string containing several blocks, each one is enclosed in curly braces and
 describes one argument. Each argument contains three parts separated by the `|` symbol:
 
--# argument names is a space-separated list of option synonyms (to mark argument as positional, prefix it with the `@` symbol)
+-# argument names is a list of option synonyms separated by standard space characters ' ' (to mark argument as positional, prefix it with the `@` symbol)
 -# default value will be used if the argument was not provided (can be empty)
 -# help message (can be empty)
 
@@ -796,6 +796,8 @@ For example:
 Note that there are no default values for `help` and `timestamp` so we can check their presence using the `has()` method.
 Arguments with default values are considered to be always present. Use the `get()` method in these cases to check their
 actual value instead.
+Note that whitespace characters other than standard spaces are considered part of the string.
+Additionally, leading and trailing standard spaces around the help messages are ignored.
 
 String keys like `get<String>("@image1")` return the empty string `""` by default - even with an empty default value.
 Use the special `<none>` default value to enforce that the returned string must not be empty. (like in `get<String>("@image2")`)