Update README.md

README.md

@@ -7,7 +7,14 @@ Port of [tabula-java](https://github.com/tabulapdf/tabula-java)
 ![Linux](https://github.com/BobLd/tabula-sharp/workflows/Linux/badge.svg)
 ![Mac OS](https://github.com/BobLd/tabula-sharp/workflows/Mac%20OS/badge.svg)
 
-Supports .NET Core 3.1; .NET Standard 2.0; .NET Framework 4.5, 4.51, 4.52, 4.6, 4.61, 4.62, 4.7
+- Supports .NET Core 3.1; .NET Standard 2.0; .NET Framework 4.5, 4.51, 4.52, 4.6, 4.61, 4.62, 4.7
+- No java bindings
+
+## Difference to tabula-java
+- Uses [PdfPig](https://github.com/UglyToad/PdfPig), and not PdfBox.
+- Coordinate system starts from the bottom left point of the page, and not from the top left point.
+- The `NurminenDetectionAlgorithm` is not yet implemented, because it requieres an image management library.
+- Table results might be different because of the way PdfPig builds Letter bounding box.
 
 # Usage
 ## Stream mode - BasicExtractionAlgorithm
@@ -37,6 +44,3 @@ using (PdfDocument document = PdfDocument.Open("doc.pdf", new ParsingOptions() {
 	var rows = table.Rows;
 }
 ```
-
-**TO DO**
-- image library not available in dotnet core - `NurminenDetectionAlgorithm`