diff --git a/lua/code-completion.lua b/lua/code-completion.lua
index 5444f5b..2413289 100644
--- a/lua/code-completion.lua
+++ b/lua/code-completion.lua
@@ -24,9 +24,9 @@ cmp.setup({
 	-- mapping
 	mapping = cmp.mapping.preset.insert({
 		-- Shift+TAB to go to the Previous Suggested item
-		["<S-Tab>"] = cmp.mapping.select_prev_item(),
+		["<C-k>"] = cmp.mapping.select_prev_item(),
 		-- Tab to go to the next suggestion
-		["<Tab>"] = cmp.mapping.select_next_item(),
+		["<C-j>"] = cmp.mapping.select_next_item(),
 		-- CTRL+SHIFT+f to scroll backwards in description
 		["<C-S-f>"] = cmp.mapping.scroll_docs(-4),
 		-- CTRL+F to scroll forwards in the description
diff --git a/lua/plugins.lua b/lua/plugins.lua
index 87a242a..fb65d1c 100644
--- a/lua/plugins.lua
+++ b/lua/plugins.lua
@@ -49,4 +49,5 @@ return require("packer").startup(function(use)
 	use("patstockwell/vim-monokai-tasty")
 	use("yannickreiss/nvim-navigator")
 	use("projekt0n/github-nvim-theme")
+	use("tpope/vim-speeddating")
 end)
diff --git a/spell/de.utf-8.add b/spell/de.utf-8.add
index b79e4df..b42fd55 100644
--- a/spell/de.utf-8.add
+++ b/spell/de.utf-8.add
@@ -80,3 +80,63 @@ Fileshare
 Verplegung
 Teambuildingmaßnahme
 Nachnahme/!
+Skale
+Bins
+äqudidistant
+univariat
+Lageparameter
+yellow
+center
+tabular
+Modalwert
+Streuungsparameter
+Zusammenhangsparameter
+univariate
+Modalwerte
+multi
+Range
+Verschiebungssatz
+violet
+Regressionsprobleme
+indigo
+Squares
+Square
+xy
+enumerate
+Multiplikationssatz
+Binomial
+hypergeometrische
+hypergeometrisch
+hypergeometrischer
+cc
+Poisson
+Uniformverteilung
+uniformverteilt
+exponentialverteilt
+Gauß'sche
+standardnormalverteilt
+Achsenssymmetrisch
+Trapezregel
+Simpson
+standardnormalverteilte
+Intervallschätzung
+Konfidenz
+argmax
+logarithmierten
+Likelihoodfunktion
+logarithmierte
+Likelihood
+cccc
+Exponential
+erwartungstreu
+Intervallschätzer
+Intervallschätzern
+Student'sche
+Intervallformel
+Quantiltabelle
+Testvariable
+Quantiltabllen
+Signifikanzlevel
+domänenabhängig
+kongeriert
+white
diff --git a/spell/de.utf-8.add.spl b/spell/de.utf-8.add.spl
index 2398be5..510e8c0 100644
Binary files a/spell/de.utf-8.add.spl and b/spell/de.utf-8.add.spl differ
diff --git a/viml/legacyconf.vim b/viml/legacyconf.vim
index c8c06d1..a32633b 100644
--- a/viml/legacyconf.vim
+++ b/viml/legacyconf.vim
@@ -1,7 +1,7 @@
 " NERDTree remap
 let g:NERDTreeDirArrowExpandable = '▸'
 let g:NERDTreeDirArrowCollapsible = '▾'
-nnoremap <C-a> :NERDTreeToggle<CR>
+nmap <C-e> :NERDTreeToggle<CR>
 
 " open builtin terminal
 function OpenTerm()