diff --git a/README.md b/README.md
index d1285b3..80950db 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,8 @@
 # overview
 
+This is about our software architecture.
+
+   Architecture is the art of decrease software developers freedom without increasing their suffering.
+
+You may find other definitions here:
+* https://martinfowler.com/architecture/
diff --git a/adr-c4k/project-section.md b/adr-c4k/project-section.md
index 1b667e6..04c40ea 100644
--- a/adr-c4k/project-section.md
+++ b/adr-c4k/project-section.md
@@ -6,8 +6,6 @@ You can use [adr-tools](https://github.com/npryce/adr-tools) for managing the AD
 
 In each ADR file, write these sections:
 
-# Title
-
 ## Status
 
 What is the status, such as proposed, accepted, rejected, deprecated, superseded, etc.?
diff --git a/principles/ConfigAsData.md b/principles/ConfigAsData.md
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--- /dev/null
+++ b/principles/ConfigAsData.md
@@ -0,0 +1,38 @@
+https://github.com/juxt/aero
+
+### Explicit and intentional
+
+Configuration should be explicit, intentful, obvious, but not clever. It
+should be easy to understand what the config is, and where it is
+declared.
+
+Determining config in stressful situations, for example, while
+diagnosing the cause of a production issue, should not be a
+[wild goose chase](http://en.wiktionary.org/wiki/wild-goose_chase).
+
+### Avoid duplication ...
+
+Config files are often duplicated on a per-environment basis, attracting
+all the problems associated with duplication.
+
+### ... but allow for difference
+
+When looking at a config file, a reader will usually ask: "Does the value differ from the default, and if so how?". It's clearly better to answer that question in-place.
+
+### Allow config to be stored in the source code repository ...
+
+When config is left out of source code control it festers and diverges from the code base. Better to keep a single config file in source code control.
+
+### ... while hiding passwords
+
+While it is good to keep config in source code control, it is important to ensure passwords and other sensitive information remain hidden.
+
+### Config should be data
+
+While it can be very flexible to have 'clever' configuration 'programs', it can be [unsafe](http://www.learningclojure.com/2013/02/clojures-reader-is-unsafe.html), lead to exploits and compromise security. Configuration is a key input to a program. Always use data for configuration and [avoid turing-complete](http://langsec.org/occupy) languages!
+
+### Use environment variables sparingly
+
+We suggest using environment variables judiciously and sparingly, the way Unix intends, and not [go mad](http://12factor.net/config). After all, we want to keep configuration explicit and intentional.
+
+Also, see these arguments [against](https://gist.github.com/telent/9742059).
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diff --git a/principles/README.md b/principles/README.md
index 82fe393..e1f628f 100644
--- a/principles/README.md
+++ b/principles/README.md
@@ -3,18 +3,10 @@
   1. Jedes Element nur einmal testen
   2. möglichst billig testen
 3. YAGNI / KISS
-
-#Postel's Law:
-
-be conservative in what you do, be liberal in what you accept from others.
-
-https://martinfowler.com/bliki/TolerantReader.html
-
 5. DDD Aufteilung nutzen
   1. Domain isoliert - isoliert testbar
   2. Inputs / Outputs validieren
   3. Aggregate bilden
-6. Configuration ist dumm
 7. Wir programmieren in Programmiersprachen und nicht in XML / Template / yaml ...
 8. Gute Programmiersprachen erfinden ist schwierig, drum lassen wir das
 9. Microkernel
diff --git a/principles/TolerantReader.md b/principles/TolerantReader.md
new file mode 100644
index 0000000..7ae1d41
--- /dev/null
+++ b/principles/TolerantReader.md
@@ -0,0 +1,5 @@
+#Postel's Law:
+
+be conservative in what you do, be liberal in what you accept from others.
+
+https://martinfowler.com/bliki/TolerantReader.html
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