diff --git a/README.md b/README.md
index 9bd275e..234213c 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 A [Telescope](https://github.com/nvim-telescope/telescope.nvim) extension that loads a list of synonyms for the word under the cusor in the current buffer, and shows their definition in the preview window. Selecting one of the synonyms replaces the word in the buffer.
 
+![Screenshot](https://raw.githubusercontent.com/wiki/rudism/telescope-dict.nvim/img/screen_shot.png)
+
 ## Requirements
 
 These should be available through your package manager (or likely already installed, in the case of `perl`):
diff --git a/lua/telescope/_extensions/dict.lua b/lua/telescope/_extensions/dict.lua
index b0e3903..db25494 100644
--- a/lua/telescope/_extensions/dict.lua
+++ b/lua/telescope/_extensions/dict.lua
@@ -1,3 +1,4 @@
+-- command
 local telescope = require('telescope')
 local pickers = require('telescope.pickers')
 local finders = require('telescope.finders')
@@ -6,13 +7,14 @@ local previewers = require('telescope.previewers')
 local previewer_utils = require('telescope.previewers.utils')
 local actions = require('telescope.actions')
 local action_state = require('telescope.actions.state')
+local Job = require('plenary.job')
 
-function script_path()
+local function script_path()
   local str = debug.getinfo(2, "S").source:sub(2)
   return str:match("(.*/)")
 end
 
-function upper_first(word)
+local function upper_first(word)
   return word:gsub("(%a)([%w_']*)", function(first, rest) return first:upper()..rest:lower() end)
 end
 
@@ -21,44 +23,44 @@ return telescope.register_extension {
     synonyms = function(opts)
       opts = opts or {}
       local cursor_word = vim.fn.expand("<cword>")
-      local command = table.concat({
-        "perl ",
-        script_path().."/cmd.pl ",
-        "synonyms ",
-        vim.fn.shellescape(cursor_word)
-      })
-      local synonyms = vim.fn.systemlist(command) or {}
-      table.insert(synonyms, cursor_word:lower())
-      pickers.new(opts, {
-        prompt_title = upper_first(cursor_word).." Synonyms",
-        finder = finders.new_table {
-          results = synonyms,
-        },
-        sorter = sorters.get_substr_matcher(),
-        previewer = previewers.new_buffer_previewer({
-          define_preview = function(self, entry, status)
-            vim.api.nvim_win_set_option(self.state.winid, 'wrap', true)
-            vim.api.nvim_win_set_option(self.state.winid, 'lbr', true)
-            local cmd = { "perl", script_path().."/cmd.pl", "definitions", entry.value }
-            return previewer_utils.job_maker(cmd, self.state.bufnr, {
-              callback = function(bufnr, content)
-                previewer_utils.highlighter(bufnr, 'yaml')
-              end
-            })
-          end,
-          title = "Definition"
-        }),
-        dynamic_preview_title = true,
-        attach_mappings = function(prompt_bufnr)
-          actions.select_default:replace(function()
-            local selection = action_state.get_selected_entry()
-            actions.close(prompt_bufnr)
-            vim.cmd("normal! ciw" .. selection[1])
-            vim.cmd "stopinsert"
-          end)
-          return true
-        end,
-      }):find()
+      Job:new({
+        command = 'perl',
+        args = { script_path().."/cmd.pl", "synonyms", cursor_word },
+        on_exit = vim.schedule_wrap(function(job)
+          local synonyms = job:result() or {}
+          table.insert(synonyms, cursor_word:lower())
+          pickers.new(opts, {
+            prompt_title = upper_first(cursor_word).." Synonyms",
+            finder = finders.new_table {
+              results = synonyms,
+            },
+            sorter = sorters.get_substr_matcher(),
+            previewer = previewers.new_buffer_previewer({
+              define_preview = function(self, entry, _)
+                vim.api.nvim_win_set_option(self.state.winid, 'wrap', true)
+                vim.api.nvim_win_set_option(self.state.winid, 'lbr', true)
+                local cmd = { "perl", script_path().."/cmd.pl", "definitions", entry.value }
+                return previewer_utils.job_maker(cmd, self.state.bufnr, {
+                  callback = function(bufnr, _)
+                    previewer_utils.highlighter(bufnr, 'yaml')
+                  end
+                })
+              end,
+              title = "Definition"
+            }),
+            dynamic_preview_title = true,
+            attach_mappings = function(prompt_bufnr)
+              actions.select_default:replace(function()
+                local selection = action_state.get_selected_entry()
+                actions.close(prompt_bufnr)
+                vim.cmd("normal! ciw" .. selection[1])
+                vim.cmd "stopinsert"
+              end)
+              return true
+            end,
+          }):find()
+        end)
+      }):start()
     end
   }
 }