Month comparators documentation.

README.md

@@ -121,7 +121,7 @@ inclusive. Returns boolean value.
 
 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.
+returned only if it is valid. Otherwise ```#f``` is returned.
 
     (month->string m)
 
@@ -133,6 +133,49 @@ If ```#f```, returns a special empty month result ```"____-__"```.
 
 Raises an error if ```m``` is not a valid month.
 
+    (month=? m n)
+
+* ```m``` - first valid month value
+* ```n``` - second valid month value
+
+Returns ```#t``` if both month values are valid and ```equal?```.
+
+    (month<? m n)
+
+* ```m``` - first valid month value
+* ```n``` - second valid month value
+
+Returns ```#t``` if both month values are valud and ```m``` comes
+before ```n``` in the calendar.
+
+    (month<=? m n)
+
+* ```m``` - first valid month value
+* ```n``` - second valid month value
+
+Returns ```#t``` if both month values are valud and ```m``` comes
+before ```n``` in the calendar or they are ```equal?```.
+
+    (month>=? m n)
+
+* ```m``` - first valid month value
+* ```n``` - second valid month value
+
+Returns ```#t``` if both month values are valud and ```m``` comes
+after ```n``` in the calendar or they are ```equal?```.
+
+    (month>? m n)
+
+* ```m``` - first valid month value
+* ```n``` - second valid month value
+
+Returns ```#t``` if both month values are valud and ```m``` comes
+after ```n``` in the calendar.
+
+month-diff
+
+month-add
+
 ### Period
 
 ### Primes