PDFBOX-3330; PDFBOX-4605: Add information for Java ImageIO plugin for JBIG2 to building from source page
diff --git a/content/building.md b/content/building.md
index 0112116..00ab8cc 100644
--- a/content/building.md
+++ b/content/building.md
@@ -35,6 +35,8 @@
We also have a read-only [Git mirror](https://git.apache.org/) which is further mirrored to GitHub as [apache/pdfbox](https://github.com/apache/pdfbox).
+The sources for the **Java ImageIO plugin for the JBIG2 image format** are available in the [Apache Git Repository](https://git-wip-us.apache.org/repos/asf?p=pdfbox-jbig2.git) or can be loaded from [GitHub](https://github.com/apache/pdfbox-jbig2).
+
## Build dependencies
### PDFBox 1.8
@@ -48,6 +50,11 @@
- [Java Cryptography Extension (JCE)](#java-cryptography-extension-jce)
- [Maven 3](http://maven.apache.org/)
+### Java ImageIO plugin for JBIG2
+
+- JDK 6
+- [Maven 3](http://maven.apache.org/)
+
### Java Cryptography Extension (JCE)
Building PDFBox 2.0 requires a JDK with "unlimited strength" cryptography, which requires extra files to be installed. For JDK 7, see [Java Cryptography Extension (JCE)](http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html). If these files are not installed, building PDFBox will fail the following test:
