diff --git a/doc/Specifications.md b/doc/Specifications.md
new file mode 100644
index 0000000000000000000000000000000000000000..6fd2352d2264c193b3e67ff5f33bc27276e2df33
--- /dev/null
+++ b/doc/Specifications.md
@@ -0,0 +1,21 @@
+# Specifications
+
+## Client-side concepts
+
+### Account
+ * An account is a PGP Key
+ * An account can be a member of multiple communities
+ * An account own at least one wallet for each currency he owns
+ * An account can own multiple wallets of the same currency
+ * An account must declare the nodes he trusts to receive transactions
+ * An account must declare the nodes he uses to send transactions for a currency type
+
+### Community
+ * A community uses one unique currency
+ * A community has members
+ * Each members of the community can issue currency following the rule defined in the community amendment
+
+### Wallets
+ * Wallets can own only one type of currency
+ * Wallets value are the sum of the transactions received and sent that the user listed in this wallet
+ 
\ No newline at end of file
diff --git a/ui/mainwindow.ui b/ui/mainwindow.ui
index f281149d30f6f7a17c77bb633dd62edc4d62c2fb..25283d39faf9fa7bc3932542de8f9770e9425b82 100644
--- a/ui/mainwindow.ui
+++ b/ui/mainwindow.ui
@@ -27,7 +27,7 @@
        <item>
         <widget class="QTabWidget" name="tabWidget">
          <property name="currentIndex">
-          <number>0</number>
+          <number>1</number>
          </property>
          <widget class="QWidget" name="walletsTab">
           <attribute name="title">