diff --git a/Validity.md b/Validity.md
index 042ff6f..03b9047 100644
--- a/Validity.md
+++ b/Validity.md
@@ -60,18 +60,18 @@ acme.sh  --issue  -d example.com --dns dns_cf   --valid-from  "2022-04-01T08:10:
 
 ```
 
-The cert time will be valid start from `"2022-04-01T08:10:33Z"`.
+The cert time will be valid starting from `"2022-04-01T08:10:33Z"`.
 
 You can also use the relative time format:
 
 ```
 
-#The cert will be valid after 2 hours:
+#The cert will be valid in 2 hours:
 
 acme.sh  --issue  -d example.com --dns dns_cf   --valid-from  "+2h"
 
 
-#The cert will be valid after 1 day:
+#The cert will be valid in 1 day:
 
 acme.sh  --issue  -d example.com --dns dns_cf   --valid-from  "+1d"
 
@@ -81,6 +81,21 @@ acme.sh  --issue  -d example.com --dns dns_cf   --valid-from  "+1d"
 
 
 
+### 3.  You can use them both at the same time:
+
+```
+# The cert will be valid from `"2022-04-01T08:10:33Z"`, and then live for 40 days to expire:
+
+acme.sh  --issue  -d example.com --dns dns_cf   --valid-from  "2022-04-01T08:10:33Z"   --valid-to "+40d"
+
+
+# The cert will be valid in 2 hours, and then live for 50 days to expire:
+
+acme.sh  --issue  -d example.com --dns dns_cf   --valid-from  "+2h"  --valid-to "+50d"
+
+```
+
+