diff --git a/README.md b/README.md
index 53a6a1b..57f3d6a 100644
--- a/README.md
+++ b/README.md
@@ -1,30 +1,27 @@
 # shell-history
 
-## setup
-
-
-
 ## zsh
 
 `~/.zshrc`:
 
 ```
-HISTDB="$HOME/dev/vlv/histdb"
+SHISTDB="$HOME/dev/vlv/histdb"
 SHIST="$HOME/dev/vlv/shell-history"
+
 autoload -Uz compinit promptinit add-zsh-hook
 
 _history() {
     if test "$(id -u)" -ne 0; then
         echo "$(date --utc --iso-8601=seconds) $(hostname) $(pwd) $(fc -ln -1)" >> \
-            $HISTDB/zsh-history-$(date "+%Y-%m-%d").log;
+            $SHISTDB/zsh-history-$(date "+%Y-%m-%d").log;
     fi
 }
 add-zsh-hook precmd _history
 
 _history-sync() {
-    if [[ -d "$HISTDB" ]]; then
+    if [[ -d "$SHISTDB" ]]; then
         () {
-            pushd -q "$HISTDB"
+            pushd -q "$SHISTDB"
             source "$SHIST/sync.sh"
             popd -q
         }