diff --git a/getTagsList.py b/getTagsList.py
index 35e3602..670a4b3 100644
--- a/getTagsList.py
+++ b/getTagsList.py
@@ -10,22 +10,48 @@
 import shlex
 import subprocess
 
-selectedDbUUID = os.getenv('selectedDbUUID', "")
+def runForCertainDB(selectedDbUUID):
+    cmdScript = "osascript -e 'tell application \"DEVONthink 3\" to get name of tag group of (get database with uuid \"{}\")' -s s".format(selectedDbUUID)
+    cmdList = shlex.split(cmdScript)
+    cmdResult = subprocess.check_output(cmdList)
+    tagList = ast.literal_eval(
+        "[" + cmdResult[1:-2].decode("UTF8") + "]")
+
+    result = []
+    for tag in tagList:
+        result.append({
+            "title": tag,
+            "subtitle": "Press Enter to list all files with this tag",
+            # "arg": tag,
+            "variables": {"selectedTag": tag, "selectedDbUUID": selectedDbUUID}
+        })
+    return result
 
-cmdScript = "osascript -e 'tell application \"DEVONthink 3\" to get name of tag group of (get database with uuid \"{}\")' -s s".format(selectedDbUUID)
-cmdList = shlex.split(cmdScript)
-cmdResult = subprocess.check_output(cmdList)
-tagList = ast.literal_eval(
-    "[" + cmdResult[1:-2].decode("UTF8") + "]")
 
+selectedDbUUID = os.getenv('selectedDbUUID', "")
 result = {"items": []}
-for tag in tagList:
-    result["items"].append({
-        "title": tag,
-        "subtitle": "Press Enter to list all files with this tag",
-        # "arg": tag,
-        "variables": {"selectedTag": tag, "selectedDbUUID": selectedDbUUID}
-    })
+
+if selectedDbUUID == '':
+    getAllUUIDs = """'set dbUUIDs to {}
+    tell application "DEVONthink 3"
+        set allDb to every database
+        repeat with theDb in allDb
+            set end of dbUUIDs to (get uuid of theDb)
+        end repeat
+    end tell
+    get dbUUIDs'"""
+    proc = subprocess.Popen("osascript -e " + getAllUUIDs.strip(),
+                            stdout=subprocess.PIPE, shell=True)
+    (out, err) = proc.communicate()
+    DbUUIDs = out.decode('utf-8').strip().split(', ')
+    for db_uuid in DbUUIDs:
+        dbresult = runForCertainDB(db_uuid)
+        result['items'].extend(dbresult)
+
+else:
+    dbresult = runForCertainDB(selectedDbUUID)
+    result['items'].extend(dbresult)
+
 
 if result['items']:
     print(json.dumps(result))