diff --git a/README.md b/README.md
index b83bc398..3a17210f 100644
--- a/README.md
+++ b/README.md
@@ -220,15 +220,15 @@ Here are some examples of conditions you can use:
 
 
 #### Placeholders
-| Placeholder                | Description                                              | Example of resolved value                    |
-|:---------------------------|:---------------------------------------------------------|:---------------------------------------------|
-| `[STATUS]`                 | Resolves into the HTTP status of the request             | 404                                          |
-| `[RESPONSE_TIME]`          | Resolves into the response time the request took, in ms  | 10                                           |
-| `[IP]`                     | Resolves into the IP of the target host                  | 192.168.0.232                                |
-| `[BODY]`                   | Resolves into the response body. Supports JSONPath.      | `{"name":"john.doe"}`                        |
-| `[CONNECTED]`              | Resolves into whether a connection could be established  | `true`                                       |
-| `[CERTIFICATE_EXPIRATION]` | Resolves into the duration before certificate expiration | `24h`, `48h`, 0 (if not protocol with certs) |
-| `[DNS_RCODE]`              | Resolves into the DNS status of the response             | NOERROR                                      |
+| Placeholder                | Description                                                                               | Example of resolved value                    |
+|:---------------------------|:------------------------------------------------------------------------------------------|:---------------------------------------------|
+| `[STATUS]`                 | Resolves into the HTTP status of the request                                              | 404                                          |
+| `[RESPONSE_TIME]`          | Resolves into the response time the request took, in ms                                   | 10                                           |
+| `[IP]`                     | Resolves into the IP of the target host                                                   | 192.168.0.232                                |
+| `[BODY]`                   | Resolves into the response body. Supports JSONPath.                                       | `{"name":"john.doe"}`                        |
+| `[CONNECTED]`              | Resolves into whether a connection could be established                                   | `true`                                       |
+| `[CERTIFICATE_EXPIRATION]` | Resolves into the duration before certificate expiration (valid units are "s", "m", "h".) | `24h`, `48h`, 0 (if not protocol with certs) |
+| `[DNS_RCODE]`              | Resolves into the DNS status of the response                                              | NOERROR                                      |
 
 
 #### Functions