diff --git a/vim/ftplugin/tex.vim b/vim/ftplugin/tex.vim
index 484d8b4..63a643a 100644
--- a/vim/ftplugin/tex.vim
+++ b/vim/ftplugin/tex.vim
@@ -20,3 +20,6 @@ set conceallevel=0
 " spell checking
 set spell
 set spell spelllang=de
+
+" set textwidth for automatic line wrap
+set tw=80
diff --git a/vim/neosnippets/tex.snip b/vim/neosnippets/tex.snip
index 176aab7..ff5f957 100644
--- a/vim/neosnippets/tex.snip
+++ b/vim/neosnippets/tex.snip
@@ -11,3 +11,15 @@ options     head
     \begin{align${1:#:options}}
         ${0}
     \end{align$1}
+
+snippet     sum
+abbr        sum
+options     head
+    \sum_{${0}}^{${1}}
+
+snippet     satz
+abbr        satz
+options     head
+    \begin{satz}
+        ${0}
+    \end{satz}