diff --git a/after/ftplugin/vimwiki.vim b/after/ftplugin/vimwiki.vim
new file mode 100644
index 0000000..c66ccdf
--- /dev/null
+++ b/after/ftplugin/vimwiki.vim
@@ -0,0 +1,5 @@
+if exists('b:did_ftplugin_taskwiki_after') | finish | endif
+let b:did_ftplugin_taskwiki_after = 1
+
+let b:taskwiki_omnifunc_fallback = len(&omnifunc) ? function(&omnifunc) : ''
+setlocal omnifunc=taskwiki#CompleteOmni
diff --git a/autoload/taskwiki.vim b/autoload/taskwiki.vim
index 0fe00ab..7f9e78f 100644
--- a/autoload/taskwiki.vim
+++ b/autoload/taskwiki.vim
@@ -36,3 +36,33 @@ endfunction
 function! taskwiki#CompleteMod(arglead, line, pos) abort
   return py3eval('cache().get_relevant_completion().modify(vim.eval("a:arglead"))')
 endfunction
+
+function! taskwiki#CompleteOmni(findstart, base) abort
+  if a:findstart == 1
+    let line = getline('.')[:col('.')-2]
+
+    " Complete modstring after -- in new tasks
+    let modstring = py3eval('cache().get_relevant_completion().omni_modstring_findstart(vim.eval("l:line"))')
+    if modstring >= 0
+      let s:omni_method = 'modstring'
+      return modstring
+    endif
+
+    " Fallback to vimwiki's omnifunc
+    if type(b:taskwiki_omnifunc_fallback) is v:t_func
+      let s:omni_method = 'fallback'
+      return b:taskwiki_omnifunc_fallback(a:findstart, a:base)
+    else
+      let s:omni_method = ''
+      return -1
+    endif
+  else
+    if s:omni_method is 'modstring'
+      return py3eval('cache().get_relevant_completion().omni_modstring(vim.eval("a:base"))')
+    elseif s:omni_method is 'fallback'
+      return b:taskwiki_omnifunc_fallback(a:findstart, a:base)
+    else
+      return []
+    endif
+  endif
+endfunction
diff --git a/doc/taskwiki.txt b/doc/taskwiki.txt
index 7c627eb..b6ec2c6 100644
--- a/doc/taskwiki.txt
+++ b/doc/taskwiki.txt
@@ -314,6 +314,11 @@ Taskwarrior:
 
 ~   * [ ] This has project home  #431f42
 
+Typing additional metadata can be simplified by using omni completion (see
+|compl-omni|), like so:
+
+~   * [ ] This has project home -- project:<C-X><C-O>
+
 ----------------------------------------------------------------------------
 5.2. Viewports                                  *taskwiki-features-viewport*
 
diff --git a/taskwiki/completion.py b/taskwiki/completion.py
index a2df7eb..b7bc373 100644
--- a/taskwiki/completion.py
+++ b/taskwiki/completion.py
@@ -4,6 +4,7 @@ import re
 from tasklib import TaskWarrior
 
 from taskwiki import constants
+from taskwiki import regexp
 
 
 def complete_last_word(f):
@@ -121,3 +122,20 @@ class Completion():
             self._complete_dates(w) or \
             self._complete_recur(w) or \
             []
+
+    def omni_modstring_findstart(self, line):
+        m = re.search(regexp.GENERIC_TASK, line)
+        if m and not m.group('uuid') and ' -- ' in line:
+            return line.rfind(' ') + 1
+        else:
+            return -1
+
+    def omni_modstring(self, w):
+        return \
+            self._complete_any(w) or \
+            self._complete_attributes(w) or \
+            self._complete_projects(w) or \
+            self._complete_tags(w) or \
+            self._complete_dates(w) or \
+            self._complete_recur(w) or \
+            []
diff --git a/tests/base.py b/tests/base.py
index 8861e44..3eccdf3 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -85,6 +85,7 @@ class IntegrationTest(object):
         self.configure_global_variables()
         self.add_plugin('taskwiki')
         self.add_plugin('vimwiki', 'plugin/vimwiki.vim')
+        self.add_plugin('taskwiki/after')
         self.filepath = os.path.join(self.dir, 'testwiki.txt')
         self.client.edit(self.filepath)
 
diff --git a/tests/test_completion.py b/tests/test_completion.py
index 5ffe3ff..45054a7 100644
--- a/tests/test_completion.py
+++ b/tests/test_completion.py
@@ -53,8 +53,19 @@ class TestCompletionUnit():
         assert c.modify("re:da") == ["re:daily", "re:day"]
         assert c.modify("recur:q") == ["recur:quarterly"]
 
+    def test_omni(self):
+        c = Completion(FakeTW())
+        assert c.omni_modstring_findstart("* [ ] x") == -1
+        assert c.omni_modstring_findstart("* [ ] x --") == -1
+        assert c.omni_modstring_findstart("* [ ] x #12345678 --") == -1
+        assert c.omni_modstring_findstart("* [ ] x -- #12345678") == -1
+        assert c.omni_modstring_findstart("* [ ] x -- ") == 11
+        assert c.omni_modstring_findstart("* [ ] x -- x") == 11
+        assert c.omni_modstring_findstart("* [ ] x -- xy") == 11
+        assert c.omni_modstring_findstart("* [ ] x -- x y") == 13
 
-class TestCompletionIntegration(IntegrationTest):
+
+class TestCompletionIntegMod(IntegrationTest):
     viminput = """
     * [ ] test task 1  #{uuid}
     * [ ] test task 2  #{uuid}
@@ -74,3 +85,23 @@ class TestCompletionIntegration(IntegrationTest):
             task.refresh()
 
         assert self.tasks[0]['project'] == "DEF"
+
+
+class TestCompletionIntegOmni(IntegrationTest):
+    viminput = """
+    * [ ] test task 1  #{uuid}
+    """
+
+    tasks = [
+        dict(description="test task 1", project="ABC"),
+    ]
+
+    def execute(self):
+        self.client.feedkeys('1gg')
+        self.client.feedkeys('otest task 2 -- pro\\<C-X>\\<C-O>A\\<C-X>\\<C-O>\\<Esc>')
+        self.client.eval('0')  # wait for command completion
+        self.command("w", regex="written$", lines=1)
+
+        task = self.tw.tasks.pending()[1]
+        assert task['description'] == 'test task 2'
+        assert task['project'] == 'ABC'