diff --git a/charter.md b/charter.md
index db622c2f7ca6c35907266a92286ba03e0bc9d5a5..a9758811a99e2abb08af156c1af859ac7d443f2d 100644
--- a/charter.md
+++ b/charter.md
@@ -11,11 +11,13 @@ SIGMathLing organizes a community of researchers and developers in Math Lingusit
 3. collecting, curating, and internally/externally distributing a set of maths linguistic resources (corpora, lexica, libraries, tools, and benchmarks).
 
 ## 2. Members
-Any individual involved in research and application development in math linguistics can join SIGMathLing, provided they agree to 
-1. a flexible NDA (all resources stay inside SIGMathLing and are used only for research purposes, unless the licenses explicitly allow so).
-2. contributing (all?) their linguistic resources into SIGMathLing
-3. opening up their analysis results to the others by contributing results 
-4. upon cessation of membership, the NDA terminates and all SIGMathLing-internal data is permanently deleted. 
+Any individual involved in research and application development in math linguistics can join SIGMathLing, provided they 
+
+1. sign an [non-disclosure agreement](/nda/) (i.e. all resources stay inside SIGMathLing and are used only for research purposes, unless the licenses explicitly allow so).
+2. agree to  contributing (all?) their linguistic resources into SIGMathLing
+3. agree to  opening up their analysis results to the others by contributing results 
+
+Upon cessation of membership, the [non-disclosure agreement](/nda/) terminates and all SIGMathLing-internal data is permanently deleted. 
 
 The SIGMathLing keeps a membership roster and supplies a member's mailing list.