diff --git a/docs/writing-templates.md b/docs/writing-templates.md
index 9dbdd59..3806a9f 100644
--- a/docs/writing-templates.md
+++ b/docs/writing-templates.md
@@ -78,9 +78,3 @@ This is equivalent to the following when using the `placeholder` template type:
 
 #### sprig functions
 The template loads the functions provided by sprig (https://masterminds.github.io/sprig/) with the exclusion of the functions are not guaranteed to evaluate to the same result for given input (https://github.com/Masterminds/sprig/blob/581758eb7d96ae4d113649668fa96acc74d46e7f/functions.go#L68-L95)
-
-#### "timeDuration" function
-The template provides a function named "timeDuration" that accept an int64 and return equivalent `time.Duration`, for example the following will render `5s`:
-```text
-{{$timeDuration := timeDuration 5000000000}}{{$timeDuration}} 
-```