diff --git a/README.md b/README.md
index b8c2022..d24dc99 100644
--- a/README.md
+++ b/README.md
@@ -96,6 +96,43 @@ Specific Support Modules
 
 ### Month
 
+Module for handling months algebra to be used in period construction
+and matching.
+
+    (make-month y m)
+
+* ```y``` - a number representing valid year
+* ```m``` - a number between 1 and 12 inclusive
+
+Constructs a new month value with ```y``` number as the year component
+and ```m``` number as the month component.
+
+    (month-valid? m)
+
+* ```m``` - constructed month value
+
+Checks whether given value is structurally valid month value, the year
+is between 1000 and 9999 inclusive and the month is between 1 and 12
+inclusive. Returns boolean value.
+
+    (string->month s)
+
+* ```s``` - a string in "YYYY-MM" format
+
+Parses given string ```s``` as month and constructs a month value from
+the YYYY and MM components parsed. The resulting month value is
+returned only if it is valid. Otherwise #f is returned.
+
+    (month->string m)
+
+* ```m``` - valid month value or ```#f```
+
+Converts given month value to a string in ```"YYYY-MM"``` format.
+
+If ```#f```, returns a special empty month result ```"____-__"```.
+
+Raises an error if ```m``` is not a valid month.
+
 ### Period
 
 ### Primes
diff --git a/bbstool.scm b/bbstool.scm
index 8619514..0b4d6ec 100644
--- a/bbstool.scm
+++ b/bbstool.scm
@@ -71,16 +71,18 @@ CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  (-mi (id) "Specify member by id" (-member-id- (string->number id)))
  (-mn (nick) "Specify member by nick" (-member-nick- nick))
  (-pi () "Print information" (-action- 'print-info))
- (-stats (fname) "Get stats for all months"
+ (-stats (file:gnuplot-data) "Get stats for all months"
 	 (-action- 'print-stats)
-	 (-fname- fname))
- (-month (month) "Specify current month"
-	 (*current-month* (string->month month)))
+	 (-fname- file:gnuplot-data))
+ (-month (YYYY-MM) "Specify current month"
+	 (*current-month* (string->month YYYY-MM)))
  (-print () "Print given member file"
 	 (-action- 'print-member-file))
  (-tests () "Run self-tests upon startup" (-run-tests?- #t))
  (-idstats () "Returns information about available member ids" (-action- 'print-idstats))
  (-genid () "Generates random member id" (-action- 'genid))
+ (-gencards (file:cards file:desfires) "Generates brmdoor-compatible card files"
+	    (print "TODO: " file:cards " " file:desfires))
  )
 
 ;; Run tests