Readme has been updated.

README.md

@@ -11,8 +11,10 @@ banknots, but table will become indeed wide.
 
 Many years ago I wrote a little script to store info on how much coins I have
 in my piggy bank. It used SQLite 3 database for it and was hardcoded to rubles.
+Why had I use whole SQL database? That was the first time I tried SQLite in
+Python.
 
-This year I came up with an idea that it would be good to learn on how to make
+Once I came up with an idea that it would be good to learn on how to make
 packages for Python. And with no better ideas I took my piggy bank script to be
 rewritten to support any currency. Database was thrown away and its place was
 took by a simple text format.
@@ -25,80 +27,84 @@ This is a CLI program that is broken down to three separate programs:
   there is no such file;
 - `piggybank-take` — takes coins from an existsing piggy bank file;
 - `piggybank-show` — shows summarised information on a piggy bank and,
-optionally, print a list of transactions.
+  optionally, print a list of transactions.
 
 ## Common flags
 
 ```bash
-piggybank-* [(-h | --help) | (-v | --version) | --list-currencies]
+piggybank-* [(-h | --help) | (-v | --version) | (-L | --list-currencies)
+  | --set-default-currency]
 ```
 
-`--help` to show help on what commands you can use.
+These flags are used with every sub-program.
+
+`--help` to show help.
 
 `--version` to show version of program.
 
 `--list-currencies` to show what currencies supported and which one is default.
 
+`--set-default-currency` to set a currency of your choice as default one.
+
 ## How to put coins in
 
 ```bash
-piggybank-put <file> [-r | --reverse] <coins> [(-c | --currency) <currency>]
+piggybank-put [-r | --reverse] COINS in FILE of CURRENCY
 ```
 
-Here's how to put coins in a piggybank file. It will also create a file if it
-doesn't exist.
-
-`<file>` is a name of a piggy bank file wich may not have a .pb extension at the
-end, it will be added automatically.
-
-`<coins>` is a set of coins' counts separated with space character. For example:
-0 0 0 5 0 4 6 7. By default trailing zeroes will be added from the
-left. So if you wrote something like 6 0 5 12 then it will be complemented to
-0 0 0 0 6 0 5 12 if currency has 8 coins.
-
 `--reverse` flag reverses the order of coins. By default they come from least
 significant face value to the most significant one and as stated above being
 complemented from left so a set shorter than number of coins in a currency,
-e.g. 5 8 4 will be interpreted as 0 0 0 0 0 5 8 4. And this flag will make it
-to be interpreted as 5 8 4 0 0 0 0 0. It is convenient if you want to add only
-coins of low face value (e.g. cents or kopeks).
+e.g. 5 8 4 will be interpreted as 0 0 0 5 8 4. And this flag will make it
+to be interpreted as 5 8 4 0 0 0. It is convenient if you want to add only
+coins of low face value (e.g. cents).
 
-`--currency` parameter specifies the currency of a new piggy bank. It will not
-change currency of an existing piggy bank.
+`COINS` is a set of coins' counts separated with space or comma character. For
+example: 0 5 0 4 6 7. By default trailing zeroes will be added from the left.
+So if you wrote something like 6 0 5 12 then it will be complemented to
+0 0 6 0 5 12 if currency has 6 coins.
+
+`FILE` is a name of a piggy bank file wich may not have a .pb extension at the
+end, it will be added automatically.
+
+`CURRENCY` specifies the currency of a new piggy bank. It will not change
+currency of an existing piggy bank. ISO standard is used, e.g. EUR.
+Case-insensitive.
 
 ### Examples:
 
 ```bash
-piggybank-put example.pb 7 4 3 0 5 -c euro
-piggybank-put example -r 0 4 6
+piggybank-put 7 4 3 0 5 in example.pb  of EUR
+piggybank-put -r 0 4 6 in example
 ```
 
 ## How to take coins out
 
 ```bash
-piggybank-take <file> [-r | --reverse] <coins>
+piggybank-take [-r | --reverse] COINS in FILE
 ```
 
-All the parameters are explained above. `--currency` flag is not applicable
-here.
+All the parameters are explained above.
 
 ### Examples:
 
 ```bash
-piggybank-take example.pb -r 0 0 4
+piggybank-take -r 0 0 4 from example.pb
 ```
 
 ## How to see what do you have
 
 ```bash
-piggybank-show <file> [-t | --transactions]
+piggybank-show FILE [ with (t | transactions)]
 ```
 
-Without `-t` flag only summarised information will be printed. `--transactions`
-flag tells the program to print out all the transactions stored in a piggy bank.
+It will print a summary table of what is stored in a piggy bank.
+
+`with t(ransactions)` will print also a table of all transactions stored in a
+file.
 
 ### Examples:
 
 ```bash
-piggybank-show example.pb -t
+piggybank-show example.pb with t
 ```