diff --git a/homelab/docs/ffmpeg Notes.md b/homelab/docs/ffmpeg Notes.md
index 9e549603..a9764941 100644
--- a/homelab/docs/ffmpeg Notes.md	
+++ b/homelab/docs/ffmpeg Notes.md	
@@ -588,4 +588,6 @@ Alternate group                          : 1
 You can create a clip from a video file without reencoding given a single time span. 
 `ffmpeg -i "$input" -ss 00:05:20 -to 00:15:30 -c:v copy -c:a copy "$output"`
 
-The time to perform this operation is based on the *size of the input file up to the starting timestamp*, not the length of the clip.
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+The time to perform this operation is based on the *size of the input file up to the starting timestamp*, not the length of the clip.
+
+Reference: [Shortstack.io](https://shotstack.io/learn/use-ffmpeg-to-trim-video/)
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