diff --git a/source/documentation/io/__index.md b/source/documentation/io/__index.md
index 59a76da..1253e03 100644
--- a/source/documentation/io/__index.md
+++ b/source/documentation/io/__index.md
@@ -72,6 +72,13 @@
 compressed. The file name is examined for an inner extension. For
 example, `.nt.gz` is gzip compressed N-Triples.
 
+Jena does not support all possible compression formats itself, only
+GZip, BZip2 and Snappy are supported directly.  If you want to use an 
+alternative compression format you can do so by piping the output of the
+relevant decompression utility into one of Jena's commands e.g.
+
+    zstd -d < FILE.nq.zst | riot --syntax NQ ...
+
 These scripts call java programs in the `riotcmd` package. For example:
 
     java -cp ... riotcmd.riot file.ttl
diff --git a/source/documentation/io/streaming-io.md b/source/documentation/io/streaming-io.md
index 73842a3..986fd7f 100644
--- a/source/documentation/io/streaming-io.md
+++ b/source/documentation/io/streaming-io.md
@@ -15,6 +15,15 @@
 to such files takes this into account, including looking for the other file
 extension.  `data.nt.gz` is parsed as a gzip-compressed N-Triples file.
 
+Jena does not support all possible compression formats itself, only
+GZip, BZip2 and Snappy are supported directly.  If you want to use an 
+alternative compression format you can do so by adding suitable dependencies
+yourself into your project and passing a suitable `InputStream`/`OutputStream` 
+implementation to Jena code e.g.
+
+    InputStream input =  new ZstdCompressorInputStream(....);
+    RDFParser.source(input).lang(Lang.NQ).parse(graph);
+
 ## StreamRDF
 
 The central abstraction is