diff --git a/README.md b/README.md
index 6c8c07a..46f9eb5 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,6 @@ void loop() {
   delay(1000);
 }
 ```
+
+## Function documentation
+`getEpochTime` returns the unix epoch, which are the seconds elapsed since 00:00:00 UTC on 1 January 1970 (leap seconds are ignored, every day is treated as having 86400 seconds). **Attention**: If you have set a time offset this time offset will be added to your epoch timestamp.