README.md - update limitation

J-Siu · Apr 15, 2021 · 9676de6 · 9676de6
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@@ -4,6 +4,7 @@
 
 - [What It Does](#what-it-does)
 - [What It Does Not](#what-it-does-not)
+- [Limitation](#limitation)
 - [Binary](#binary)
 - [Compile](#compile)
 - [Usage](#usage)
@@ -28,6 +29,11 @@
 - Check file extension
 - Transform PNG
 
+### Limitation
+
+- ICO file always created from scratch, no append nor replace within ICO file
+- PNG to ICO only, other format/conversion not supported
+
 ### Binary
 
 https://github.com/J-Siu/go-png2ico/releases