diff --git a/docs/TapTrade_obs/.obsidian/workspace.json b/docs/TapTrade_obs/.obsidian/workspace.json
index eb7ed4b..ebbfce3 100755
--- a/docs/TapTrade_obs/.obsidian/workspace.json
+++ b/docs/TapTrade_obs/.obsidian/workspace.json
@@ -148,17 +148,17 @@
   },
   "active": "bdb9fd88a01a8909",
   "lastOpenFiles": [
+    "Research/Bitcoin fundamentals/Taproot output structure.canvas",
+    "Research/Bitcoin fundamentals/Spending Taproot UTXOs.md",
     "Research/Trade Pipelines/new concepts/concept pipeline 1.canvas",
     "Research/Trade Pipelines/new concepts/concept locking script 1.canvas",
+    "Research/Bitcoin fundamentals/Knowledge sources.md",
     "assets/Pasted image 20240611120722.png",
     "assets/Pasted image 20240611105421.png",
     "assets/ptlc2.png",
     "assets/ptlc.png",
-    "Research/Bitcoin fundamentals/Knowledge sources.md",
     "Research/Trade Pipelines/current trade flow.canvas",
     "Research/Implementation/Libraries.md",
-    "Research/Bitcoin fundamentals/Taproot output structure.canvas",
-    "Research/Bitcoin fundamentals/Spending Taproot UTXOs.md",
     "Research/Bitcoin fundamentals/Signature and Flags.canvas",
     "Research/Implementation/CLI demonstrator architecture/demonstrator architecture.canvas",
     "Research/Implementation/UI ideas.canvas",
diff --git a/docs/TapTrade_obs/Research/Bitcoin fundamentals/Knowledge sources.md b/docs/TapTrade_obs/Research/Bitcoin fundamentals/Knowledge sources.md
index bf866d8..5414e6b 100755
--- a/docs/TapTrade_obs/Research/Bitcoin fundamentals/Knowledge sources.md	
+++ b/docs/TapTrade_obs/Research/Bitcoin fundamentals/Knowledge sources.md	
@@ -97,4 +97,7 @@ https://dev.to/eunovo/a-guide-to-creating-taproot-scripts-with-bitcoinjs-lib-4op
 [Replacing HTLC's](https://suredbits.com/payment-points-part-1/#references)
 https://bitcointalk.org/index.php?topic=5455282.0
 https://extheo.hashnode.dev/point-time-locked-contracts-part-one
-https://suredbits.com/ptlc-proof-of-concept/
\ No newline at end of file
+https://suredbits.com/ptlc-proof-of-concept/
+
+### <u>Descriptors</u>
+[Descriptor Explanation](https://thunderbiscuit.github.io/Learning-Bitcoin-from-the-Command-Line/03_5_Understanding_the_Descriptor.html)