diff --git a/DIR_INFO b/DIR_INFO
index f05e9a881..53261a52b 100644
--- a/DIR_INFO
+++ b/DIR_INFO
@@ -1 +1 @@
-The root dir for the Lumiera project
+Root of the main Lumiera project tree
diff --git a/data/DIR_INFO b/data/DIR_INFO
index fc5c22ea2..f691b6d45 100644
--- a/data/DIR_INFO
+++ b/data/DIR_INFO
@@ -1 +1 @@
-Additional configuration, icons, graphics etc. to be installed with Lumiera
+Additional configuration, icons, graphics for install
diff --git a/doc/design/DIR_INFO b/doc/design/DIR_INFO
new file mode 100644
index 000000000..4f75272b5
--- /dev/null
+++ b/doc/design/DIR_INFO
@@ -0,0 +1 @@
+design and concepts
diff --git a/doc/technical/DIR_INFO b/doc/technical/DIR_INFO
new file mode 100644
index 000000000..307341317
--- /dev/null
+++ b/doc/technical/DIR_INFO
@@ -0,0 +1 @@
+technical documentation
diff --git a/doc/user/DIR_INFO b/doc/user/DIR_INFO
index 61d585d2f..9bffac5af 100644
--- a/doc/user/DIR_INFO
+++ b/doc/user/DIR_INFO
@@ -1 +1 @@
-user documentation in texinfo
+user documentation and manual
diff --git a/src/DIR_INFO b/src/DIR_INFO
index b6c7308d3..b7c705736 100644
--- a/src/DIR_INFO
+++ b/src/DIR_INFO
@@ -1 +1 @@
-root of sourcecode tree
+Lumiera applilcation sourcecode tree
diff --git a/src/backend/DIR_INFO b/src/backend/DIR_INFO
index 0c5dfc094..c046837b6 100644
--- a/src/backend/DIR_INFO
+++ b/src/backend/DIR_INFO
@@ -1,2 +1,2 @@
-data and caching backend
+Lumiera backend layer sourcecode
 
diff --git a/src/common/DIR_INFO b/src/common/DIR_INFO
index e3b6d818a..8b648aa43 100644
--- a/src/common/DIR_INFO
+++ b/src/common/DIR_INFO
@@ -1,7 +1 @@
-Common application services (liblumieracommon)
-
-contains:
- * the config system
- * commandline parsing
- * interfaces and plugin loading
- * lua interpreter (planned)
+Common application services
diff --git a/src/gui/DIR_INFO b/src/gui/DIR_INFO
new file mode 100644
index 000000000..cad7376e2
--- /dev/null
+++ b/src/gui/DIR_INFO
@@ -0,0 +1 @@
+Lumiera GTK GUI
diff --git a/src/lumiera/DIR_INFO b/src/lumiera/DIR_INFO
index fc536d0ed..2a31026e8 100644
--- a/src/lumiera/DIR_INFO
+++ b/src/lumiera/DIR_INFO
@@ -1 +1 @@
-The Lumiera application shell
+The Lumiera application
diff --git a/src/tool/DIR_INFO b/src/tool/DIR_INFO
index c8933be3e..db1f8c765 100644
--- a/src/tool/DIR_INFO
+++ b/src/tool/DIR_INFO
@@ -1 +1 @@
-source code of supplementary tools to be built alongside with Lumiera
+source code of supplementary tools
diff --git a/target/DIR_INFO b/target/DIR_INFO
index 8764b3989..7a85b70c2 100644
--- a/target/DIR_INFO
+++ b/target/DIR_INFO
@@ -1 +1 @@
-Lumiera program package tree, holding executable(s) and libraries to be built
+Lumiera Application binary tree, executable(s) and modules
diff --git a/target/modules/DIR_INFO b/target/modules/DIR_INFO
index ffdc4efcb..21643380f 100644
--- a/target/modules/DIR_INFO
+++ b/target/modules/DIR_INFO
@@ -1 +1 @@
-Lumiera subsystems and other dynamically loadable application components
+Lumiera subsystems and dynamically loadable components
diff --git a/tests/DIR_INFO b/tests/DIR_INFO
index cd5d69231..f6bbbc963 100644
--- a/tests/DIR_INFO
+++ b/tests/DIR_INFO
@@ -1 +1 @@
-test suite
+Lumiera test suite sourcecode
diff --git a/tests/components/DIR_INFO b/tests/components/DIR_INFO
index 55fe55def..a01bda331 100644
--- a/tests/components/DIR_INFO
+++ b/tests/components/DIR_INFO
@@ -1 +1 @@
-Testsuite sourcecode tree
+core components testsuite
diff --git a/tests/lib/DIR_INFO b/tests/lib/DIR_INFO
new file mode 100644
index 000000000..7855cfb57
--- /dev/null
+++ b/tests/lib/DIR_INFO
@@ -0,0 +1 @@
+support library testsuite
diff --git a/wiki/DIR_INFO b/wiki/DIR_INFO
index 2bbb2fa6b..c9eb35989 100644
--- a/wiki/DIR_INFO
+++ b/wiki/DIR_INFO
@@ -1 +1 @@
-tiddlywiki for semi-persistent documentation
+TiddlyWiki to document ongoing work