diff --git a/IQ-trim.md b/IQ-trim.md
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@@ -1,3 +1,19 @@
 IQ Trim allows you to trim "radio silence" from the beginning and end of a C16 or C8 capture file.
 
 ![IQTrim](https://github.com/eried/portapack-mayhem/assets/3761006/e83a4ca5-af1d-4aeb-918f-1df056fb3d04)
+
+## UI Components
+
+* **Capture path** - select to pick the capture file to open.
+* **IQ Display** - shows the IQ file power in 240 buckets.
+* **Start** - Starting sample of the trim region. Can be modified.
+* **End** - Ending sample of the trim region. Can be modified.
+* **Samples** - Number of samples int the capture file.
+* **Max Pwr** - Power (complex magnitude) of the "strongest" samplein the capture file.
+* **Cutoff** - Signal to Noise cutoff as a percentage of the Max Pwr. Can be modified.
+
+## Trimming Files
+1. Open a capture file. You should hopefully see a trimmable region in the IQ Display control.
+  1. If you don't see a block in the IQ Display, the capture signal was too weak for the tool.
+2. Manually set Start/End or use the Cutoff % to automatically trim.
+3. Press "Trim" - the file will be edited. It does not make a backup so be careful with your favorite sample files. Maybe use FileMan to make a backup first.