diff --git a/doc b/doc
index 067ff23..c68628b 160000
--- a/doc
+++ b/doc
@@ -1 +1 @@
-Subproject commit 067ff23dc8b28c70d883e832dea29dbb90196154
+Subproject commit c68628b1e5600b62a35d884b52f5a21fd80a22a1
diff --git a/numericx.c b/numericx.c
index d14fb4c..3518fcc 100644
--- a/numericx.c
+++ b/numericx.c
@@ -16,8 +16,8 @@
  * @name Compilation Flags
  *
  * These are the valid compilation flags for the definition of numerical systems.
- * Use them to make the program show more output, or
- * to set the proprieties of the FROM and the TO numerical system.
+ * Use them to set the proprieties of the FROM and the TO numerical system, when
+ * compiling the cli executable.
  *
  * @{
  */
@@ -117,7 +117,7 @@ typedef struct NumeralPtr
  * new numeral ('to_first').
  *
  * @param last_numeral - last numeral_ptr* into which new numeral_ptr will be added.
- * @param to_first - symbol of the new digit.
+ * @param to_first - the symbol of the new digit.
  *
  * @return pointer to new numeral_ptr in case of success.
  * @return NULL in case of no memory.
@@ -208,8 +208,8 @@ increment(numeral_ptr* numeral, char* num_first, char* num_last, char* brand_new
  *
  * It needs to know the first numeral ('first_numeral') and also the
  * last numeral ('last_numeral'). It also needs the numeral system in
- * form of a string ('numeral_system') to know which is the numeral
- * before the actual numeral that needs decrementation.
+ * form of a string ('numeral_system') to know which is the numeral,
+ * before the actual numeral, that needs decrementation.
  *
  * @param number - the string number to be decremented.
  * @param first_numeral - number's numeral system first numeral.
@@ -371,7 +371,7 @@ free_numeral(numeral_ptr* numeral)
 /**
  * @brief Free numericx result.
  *
- * Function frees up the result of numericx_translate(),
+ * Free up the result string of numericx_translate(),
  * after we are done with it.
  *
  * @param string - char pointer to be free.
@@ -390,7 +390,7 @@ numericx_free(char* string)
  * @param numeral - numeral_ptr to be converted to string.
  * @param result_with_units_on_the_end - define if result has units on the end.
  *
- * @return char pointer to converted string in case of success.
+ * @return char pointer to converted string, in case of success.
  * @return NULL in case of no memory.
  */
 char*
@@ -440,19 +440,19 @@ numeral_to_string(numeral_ptr* numeral, bool result_with_units_on_the_end)
  * 'from' to the 'to' numerical system, resulting in a string.
  *
  * @param from - string with all the numerals of the number's numerical system.
+ * @param from_units_on_the_end - does the translate 'from' numerical system have units on the end (on the right)?
+ * @param from_first_number_void - does the translate 'from' numerical system start counting on the second number?
+ * @param from_infinite_base - is the translate 'from' numerical system first numeral infinite? For example, if first numeral is 'A', then does 'A' == 'AA' == 'AAA' == 'AAAA' ... ?
  * @param to - string with all the numerals of the resulting number's numerical system.
- * @param from_units_on_the_end - does the translate from numerical system have units on the end (on the right)?
- * @param to_units_on_the_end - does the translate to numerical system have units on the end (on the right)?
- * @param from_first_number_void - does the translate from numerical system start counting on the second number?
- * @param to_first_number_void - does the translate to numerical system start counting on the second number?
- * @param from_infinite_base - is the translate from numerical system first numeral infinite? For example, if first numeral is 'A', then does 'A' == 'AA' == 'AAA' == 'AAAA' ... ?
- * @param to_infinite_base - is the translate to numerical system first numeral infinite? For example, if first numeral is 'A', then does 'A' == 'AA' == 'AAA' == 'AAAA' ... ?
- * @param number - number of the from numerical system, to be translated into the to numerical system.
+ * @param to_units_on_the_end - does the translate 'to' numerical system have units on the end (on the right)?
+ * @param to_first_number_void - does the translate 'to' numerical system start counting on the second number?
+ * @param to_infinite_base - is the translate 'to' numerical system first numeral infinite? For example, if first numeral is 'A', then does 'A' == 'AA' == 'AAA' == 'AAAA' ... ?
+ * @param number - number of the 'from' numerical system, to be translated into the 'to' numerical system.
  * @param result_string - string to where to store the result.
  *
  * @return EINVAL if argument of result_string is not NULL.
- * @return EDOM if number doesn't belong to the from numerical system.
- * @return ERANGE if the resulting number cannot be represented, because of a from void number and a lack of void number in to.
+ * @return EDOM if number doesn't belong to the 'from' numerical system.
+ * @return ERANGE if the resulting number cannot be represented, because of a 'from' void number and a lack of void number in 'to'.
  * @return EXIT_SUCCESS in case of success.
  */
 int
@@ -541,13 +541,14 @@ numericx_translate(char* from, bool from_units_on_the_end, bool from_first_numbe
  * @brief CLI program.
  *
  * This is a command-line interface program, that uses the 'numericx_*'
- * functions. It receives on number and returns the translated number.
+ * functions. It receives one number argument from the command-line and
+ * prints the translated number, or an error message.
  *
- * @param argv[] - one number as a string
+ * @param argv[] - one number from the command-line.
  *
- * @return E2BIG in case of wrong number of arguments
- * @return EXIT_FAILURE in case of unsuccessful number translation
- * @return EXIT_SUCCESS in case of a successful number translation
+ * @return E2BIG in case of wrong number of arguments.
+ * @return EXIT_FAILURE in case of unsuccessful number translation.
+ * @return EXIT_SUCCESS in case of a successful number translation.
  */
 int
 main(int argc, char* argv[])