diff --git a/README.md b/README.md
index d1ab293..9ab733b 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ This is a YAML network protocol dictionary for all (binary based) OSI-Layer 1-4
 - What it is clearly **NOT**:
   - Currently: complete.
   - A replacement for reading RFCs
+    - Dependencies and constraints are **NOT** defined in this dictionary
   - A source for implementing network stacks