diff --git a/deps/update_pjsip_210/README b/deps/update_pjsip_210/README
index cf1a8625..4da44aa7 100644
--- a/deps/update_pjsip_210/README
+++ b/deps/update_pjsip_210/README
@@ -1 +1,18 @@
-This is experiemental work in progress, not functional yet.
+This patch must be applied once, on top of the darcs tag:
+
+before-pjsip-210
+
+The following patches have been preserved as a reference for future
+upgrades:
+
+ - deps/update_pjsip_210/patches/pjsip_210.patch
+ - deps/update_pjsip_210/patches/zsrtp.patch
+
+SIP SIMPLE SDK depends hereinafter upon the following third party sources:
+
+- PJSIP base revision 210 from 2020-02-14
+  https://github.com/pjsip/pjproject/archive/2.10.tar.gz
+
+- ZRTP tag 6b3cd8e6783642292bad0c21e3e5e5ce45ff3e03
+  https://github.com/wernerd/ZRTPCPP.git
+
diff --git a/docs/Dependencies.txt b/docs/Dependencies.txt
index 1a349eff..a25381de 100644
--- a/docs/Dependencies.txt
+++ b/docs/Dependencies.txt
@@ -1,21 +1,29 @@
 
 SIP SIMPLE client SDK dependencies
 ----------------------------------
 
 Home page: http://sipsimpleclient.org
 
-Python packages available from AG Projects:
+SIP SIMPLE SDK depends upon the following third party C sources:
+
+- PJSIP base revision 210 from 2020-02-14
+  https://github.com/pjsip/pjproject/archive/2.10.tar.gz
+
+- ZRTP tag 6b3cd8e6783642292bad0c21e3e5e5ce45ff3e03
+  https://github.com/wernerd/ZRTPCPP.git
+
+Python dependencies available from AG Projects repositories:
 
  * python3-application      http://download.ag-projects.com/SipSimpleSDK/Python3/ 
  * python3-eventlib         http://download.ag-projects.com/SipSimpleSDK/Python3/ 
  * python3-gnutls           http://download.ag-projects.com/SipSimpleSDK/Python3/
  * python3-otr              http://download.ag-projects.com/SipSimpleSDK/Python3/
  * python3-msrplib          http://download.ag-projects.com/SipSimpleSDK/Python3/
  * python3-xcaplib          http://download.ag-projects.com/SipSimpleSDK/Python3/
 
 The dependencies for each package can be found inside debian/control file
 
 On a Debian or Ubuntu based system you can install their dependencies using:
 
 sudo mk-build-deps --install debian/control