updated usage information

jpohjolainen · Jun 4, 2015 · b3e1e62 · b3e1e62
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diff --git a/README.md b/README.md
@@ -3,6 +3,9 @@
 ```shell
 usage: ./calc-date <date> +-<delta>|<date>
 
+Returns a date after <delta> is added or substracted to <date> or time difference
+between two dates.
+
 date    iso8601 format, e.g. 2015-06-01T09:45:53
 delta   time to count from date. Select operation with + or - followed
         by any combination of:

diff --git a/calc-date b/calc-date
@@ -82,6 +82,9 @@ def main():
     if len(sys.argv) < 3:
         print "usage: %s <date> +-<delta>|<date>" % (sys.argv[0])
         print """
+Returns a date after <delta> is added or substracted to <date> or time difference
+between two dates.
+
 date    iso8601 format, e.g. 2015-06-01T09:45:53
 delta   time to count from date. Select operation with + or - followed
         by any combination of: