diff --git a/contrib/bash/completion.bash b/contrib/bash/completion.bash
index a7fd1e7..8d1101d 100644
--- a/contrib/bash/completion.bash
+++ b/contrib/bash/completion.bash
@@ -51,7 +51,7 @@ _btrbk()
     [[ $COMPREPLY == *= ]] && compopt -o nospace
   else
     if [[ ! -v 'cmds[0]' ]]; then
-      COMPREPLY=($(compgen -W 'run dryrun snapshot resume prune archive clean stats list usage origin diff ls' -- "$cur"))
+      COMPREPLY=($(compgen -W 'run dryrun snapshot resume prune archive clean stats list usage origin diff extents ls' -- "$cur"))
     fi
   fi
 
@@ -83,6 +83,15 @@ _btrbk()
       # <path>|<url>...
       _filedir -d
       ;;
+    'extents')
+      # [diff] <path>... [exclusive] <path>...
+      if [[ ! -v 'cmds[1]' ]]; then
+          COMPREPLY+=($(compgen -W 'diff' -- "$cur"))
+      elif [[ ! ${cmds[*]} =~ (^|[[:space:]])"exclusive"($|[[:space:]]) ]]; then
+          COMPREPLY+=($(compgen -W 'exclusive' -- "$cur"))
+      fi
+      _filedir -d
+      ;;
   esac
 } && complete -F _btrbk btrbk