diff --git a/.README.md b/.README.md
index 30514b6..8707c42 100644
--- a/.README.md
+++ b/.README.md
@@ -359,8 +359,9 @@ Command|Description
 
 Command|Description
 ---|---
-`checksum new`|Create checksums recursively.
-`checksum check`|Check previously created checksums.
+`checksum_create`|Create checksums for files in current directory.
+`checksum_check`|Check previously created checksums.
+`checksum_update`|Check old hashes and create new ones for all the files.
 
 ## Chmod.
 
diff --git a/.config/bash/module/checksum.sh b/.config/bash/module/checksum.sh
index c039ce3..154f70b 100644
--- a/.config/bash/module/checksum.sh
+++ b/.config/bash/module/checksum.sh
@@ -1,37 +1,28 @@
-# create or check checksums for all files in current directory.
-# usage: checksum <ACTION>
-# actions: "new", "check".
-checksum()
+checksum_create()
 {
-  local action="$1"          # what to do with checksum.
-  local file="checksum.sha1" # file name to store checksums.
-
-  if [[ "$action" =~ ^(n|new)$  ]]; then
-    # create checksums for all files.
-    find -type f | parallel sha1sum {} >> "$file"
-    
-    # remove checksum file from resulting hashes.
-    sed -i "/$file/d" "$file"
-    
-    return 0
+  if [[ -f .checksum ]]; then
+    echo -e "${color_bred}Checksum already exists.${color_default}"
+    return 1
   fi
 
-  if [[ "$action" =~ ^(c|check)$ ]]; then
-    # check checsums for all files.
-    sha1sum --quiet -c ./checksum.sha1
-    
-    return 0
-  fi
+  sha1sum * > .checksum 2> /dev/null
   
-  # error on wrong action.
-  echo "supported actions: new (n), check (c)."
-  return 2
+  sed -i "/\.checksum/d" .checksum
 }
 
-# autocomplete.
-_checksum()
+checksum_check()
 {
-  _autocomplete_first "{new,check}"
+  sha1sum --quiet -c .checksum
 }
 
-complete -F _checksum checksum
+checksum_update()
+{
+  if [[ ! -f .checksum ]]; then
+    echo -e "${color_bred}Checksum doesn't exists.${color_default}"
+    return 1
+  fi
+
+  sha1sum --quiet -c .checksum && rm .checksum && sha1sum * > .checksum 2> /dev/null
+
+  true
+}