Update docs

docs/CHANGELOG.md

@@ -1,6 +1,6 @@
 ## v0.4
 
-Add simple spectrum analyser
+Add simple spectrum analyser and basic software scaling support
 
 ## v0.3
 

docs/README.md

@@ -17,3 +17,5 @@ parse this data using the Python script in the flipperscope repo.
 
 * Setup screen allows you to choose an FFT option, to display a simple spectrum analyser.  You can alter the size of
 the FFT window also.
+
+* Setup screen allows you to scale the size of a signal via software.