diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 32f7e69..1ea016d 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,14 +2,7 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="208c8f22-eeea-487d-8a23-c2fce1eb1434" name="Default" comment="">
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/protocols/osi1-2/arp.yml" afterPath="$PROJECT_DIR$/protocols/osi1-2/arp.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/protocols/osi1-2/eth-frame.yml" afterPath="$PROJECT_DIR$/protocols/osi1-2/eth-frame.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/protocols/osi1-2/eth-packet.yml" afterPath="$PROJECT_DIR$/protocols/osi1-2/eth-packet.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/protocols/osi3/icmpv4.yml" afterPath="$PROJECT_DIR$/protocols/osi3/icmpv4.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/protocols/osi3/ipv4.yml" afterPath="$PROJECT_DIR$/protocols/osi3/ipv4.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/schema.yml" afterPath="$PROJECT_DIR$/schema.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/validate.py" afterPath="$PROJECT_DIR$/validate.py" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/README.md" afterPath="$PROJECT_DIR$/README.md" />
     </list>
     <ignored path="npd.iws" />
     <ignored path=".idea/workspace.xml" />
diff --git a/README.md b/README.md
index 64c7e4e..4051183 100644
--- a/README.md
+++ b/README.md
@@ -23,11 +23,17 @@ Simple, isn't it?
 How to add a new protocol
 ----
 
-- Clone. 
-- Install ruby+[kwalify](http://www.kuwata-lab.com/kwalify/) (gem install kwalify).
+Requirements:
+- Python 3.5
+  - jsonschema
+  - PyYaml
+- (the old kwalify schemas are still present, but deprecated.)
+
+Howto:
+- Clone.
 - Check structure-schema.yml.  
-- Write protocol file in ./protocols/osi[layer]/[protocolname].yml. 
-- Validate structure with 'kwalify -lf structure-schema.yml [path/to/protocolname].yml' or validate all at once with 'kwalify -lf structure-schema.yml ./protocols/osi*/*.yml'. 
+- Write protocol file in ./protocols/osi[layer]/[protocolname].yml.
+- Validate structure with 'python validate.py -f [path/to/protocolname].yml' or all at once with 'python validate.py --all'
 - Set up a merge request.
 - Be happy.
 
@@ -36,9 +42,9 @@ How to use this dictionary
 
 Currently not recommended, because the project lacks deeper tests than just schema validation. ;)
 
-- Clone. 
+- Clone.
 - Get a YAML library for your program language. Or get a converter for JSON or XML, to use these markup languages.
-- Load desired protocol files, or all of them. 
+- Load desired protocol files, or all of them.
 - Use resulting data structures to build protocol packet structures.
 
 This repository will provide examples or useable code snippets for specific programming languages in the future...