diff --git a/docs/build/smart-contract/basic-concepts/coins.mdx b/docs/build/smart-contract/basic-concepts/coins.mdx
index c1c6a2f98..c1d4660c1 100644
--- a/docs/build/smart-contract/basic-concepts/coins.mdx
+++ b/docs/build/smart-contract/basic-concepts/coins.mdx
@@ -1,6 +1,7 @@
 # Interacting with MAS Tokens in Massa smart contracts
 In Massa smart contracts, you can interact with the MAS token to perform various financial operations, such as sending and receiving MAS tokens, checking balances, and transferring tokens between addresses.
 The Mas token is represented as a u64 value.
+All Mas token related functions in AssemblyScript are available in the [@massalabs/massa-as-sdk](https://github.com/massalabs/massa-as-sdk) package.
 Here’s a guide on how to handle these interactions within a contract.
 
 :::caution
diff --git a/sidebars.js b/sidebars.js
index c12dd5064..f5cae6c78 100644
--- a/sidebars.js
+++ b/sidebars.js
@@ -249,7 +249,7 @@ const sidebars = {
         },
         {
           type: "category",
-          collapsible: false,
+          collapsible: true,
           label: "Basic concepts",
           items: [
             {