4 files changed, 14 insertions, 0 deletions

diff --git a/src/bzip2.h b/src/bzip2.h
index 0b5140d..9a8d172 100644
--- a/src/bzip2.h
+++ b/src/bzip2.h
@@ -15,8 +15,10 @@
 namespace Bu
 {
         /**
+         * Provides BZip2 type compression and decompression.
          *
          *@ingroup Streams
+         *@ingroup Compression
          */
         class BZip2 : public Bu::Filter
         {
diff --git a/src/deflate.h b/src/deflate.h
index 20d609a..34e8657 100644
--- a/src/deflate.h
+++ b/src/deflate.h
@@ -15,8 +15,12 @@
 namespace Bu
 {
         /**
+         * Provides Deflate (LZ77) support via zlib.  This provides zlib, raw, and
+         * gzip stream types.  By default it will autodetect the input type and
+         * encode into a raw deflate stream.
          *
          *@ingroup Streams
+         *@ingroup Compression
          */
         class Deflate : public Bu::Filter
         {
diff --git a/src/doxy/groups.dox b/src/doxy/groups.dox
index 479186a..6b7cd57 100644
--- a/src/doxy/groups.dox
+++ b/src/doxy/groups.dox
@@ -29,3 +29,8 @@
  *@defgroup Streams Streams
  * Streams are for data.
  */
+
+/**
+ *@defgroup Compression Compression
+ * Filters that give access to common compression libraries.
+ */
diff --git a/src/lzma.h b/src/lzma.h
index 21da6e8..090da8d 100644
--- a/src/lzma.h
+++ b/src/lzma.h
@@ -15,8 +15,11 @@
 namespace Bu
 {
         /**
+         * Provides XZ compression and decompression, both LZMA1 (LzmaAlone) as
+         * well as the newer LZMA2 (xz) format.  This uses .xz by default.
          *
          *@ingroup Streams
+         *@ingroup Compression
          */
         class Lzma : public Bu::Filter
         {