docs: document days of year feature in readme

README.md

@@ -31,7 +31,7 @@ INFO[4804] Killing pod chaoskube/nginx-701339712-51nt8
 ...
 ```
 
-`chaoskube` allows to filter target pods [by namespaces, labels and annotations](#filtering-targets) as well as [exclude certain weekdays or times of day](#limit-the-chaos) from chaos.
+`chaoskube` allows to filter target pods [by namespaces, labels and annotations](#filtering-targets) as well as [exclude certain weekdays, times of day and days of a year](#limit-the-chaos) from chaos.
 
 ## How
 
@@ -140,9 +140,9 @@ spec:
 
 ## Limit the Chaos
 
-You can limit the time when chaos is introduced by weekdays, time periods of a day or both.
+You can limit the time when chaos is introduced by weekdays, time periods of a day, day of a year or all of them together.
 
-Add a comma-separated list of abbreviated weekdays via the `--excluded-weekdays` options and/or a comma-separated list of time periods via the `--excluded-times-of-day` option and specify a `--timezone` by which to interpret them.
+Add a comma-separated list of abbreviated weekdays via the `--excluded-weekdays` options, a comma-separated list of time periods via the `--excluded-times-of-day` option and/or a comma-separated list of days of a year via the `--excluded-days-of-year` option and specify a `--timezone` by which to interpret them.
 
 Use `UTC`, `Local` or pick a timezone name from the [(IANA) tz database](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones). If you're testing `chaoskube` from your local machine then `Local` makes the most sense. Once you deploy `chaoskube` to your cluster you should deploy it with a specific timezone, e.g. where most of your team members are living, so that both your team and `chaoskube` have a common understanding when a particular weekday begins and ends, for instance. If your team is spread across multiple time zones it's probably best to pick `UTC` which is also the default. Picking the wrong timezone shifts the meaning of a particular weekday by a couple of hours between you and the server.
 
@@ -156,6 +156,7 @@ Use `UTC`, `Local` or pick a timezone name from the [(IANA) tz database](https:/
 | `--namespaces`            | namespace selector to filter pods by                                 | (all namespaces)           |
 | `--excluded-weekdays`     | weekdays when chaos is to be suspended, e.g. "Sat,Sun"               | (no weekday excluded)      |
 | `--excluded-times-of-day` | times of day when chaos is to be suspended, e.g. "22:00-08:00"       | (no times of day excluded) |
+| `--excluded-days-of-year` | days of a year when chaos is to be suspended, e.g. "Apr1,Dec24"      | (no days of year excluded) |
 | `--timezone`              | timezone from tz database, e.g. "America/New_York", "UTC" or "Local" | (UTC)                      |
 | `--dry-run`               | don't kill pods, only log what would have been done                  | true                       |