diff --git a/operational b/operational
index 96dbe953047fc21755623d7e98ffe554ee021d26..2eea61a8fe67241ea36e787150d41ec6bb3d9188 100644
--- a/operational
+++ b/operational
@@ -1,6 +1,6 @@
 * COMMENT -*- mode: org -*-
 #+Date: 2019-10-08
-Time-stamp: <2020-02-21>
+Time-stamp: <2020-02-23>
 #+STARTUP: content
 * notes                                                               :entry:
 ** 2019-04-01 zero-el a Chinese IM framework in emacs; FSM              :doc:
@@ -123,6 +123,34 @@ cd ~/lisp/elisp/zero/
 * later                                                               :entry:
 * current                                                             :entry:
 ** 
+** 2020-02-23 support typing ±, ≥, ≤ easier.
+when user type +-, it is converted to ±.
+use a flag to control conversion.
+zero-input-auto-symbol-p default value is 'FULL, means only enable when
+punctuation mode is 'FULL. if set to t, always convert char to symbol. if set
+to nil, never convert char to symbol.
+
+Non-nil means auto convert some consective character to related symbol.
+
+#+BEGIN_SRC elisp
+  (defcustom zero-input-auto-symbol-alist
+    '(((?+ ?-) "±")
+      ((?> ?=) "≥")
+      ((?< ?=) "≤")
+      ((?* ?x) "×")
+      ((?< ?>) "≠")
+      ((?! ?=) "≠"))
+    "When user type chars in key, convert it to symbol in the value."
+    :group 'zero-input
+    :type 'TODO)
+#+END_SRC
+((?* ?x) "×") this one is different. x will be preedit str.
+it's better if this is wrapped in a new mode.
+like v mode used in some IM.
+type v > = will show ≥ in candidate list.
+
+- rethink about it later.
+
 ** 2020-02-21 zero-pinyin-service and zero-panel should recommend or suggest dbus pkg.
 I don't know it should recommend or suggest.
 ** 2019-10-23 checkdoc and package-lint can't ignore some non-issues.
diff --git a/zero-input-framework.el b/zero-input-framework.el
index b55d90c0a4135183e369070d87e77a721478027c..0f0c6c9ec5228a7344bec903b4db253637f37d55 100644
--- a/zero-input-framework.el
+++ b/zero-input-framework.el
@@ -133,7 +133,7 @@ If item is not in lst, return nil."
 
 ;; zero-input-el version
 (defvar zero-input-version nil "Zero package version.")
-(setq zero-input-version "2.6.0")
+(setq zero-input-version "2.7.0")
 
 ;; FSM state
 (defconst zero-input--state-im-off 'IM-OFF)
@@ -192,6 +192,7 @@ independent from punctuation map.  You can change this via
     (?^ "……")
     (?~ "～")
     (?\; "；")
+    (?\` "·")
     (?$ "￥"))
   "Additional punctuation map used when `zero-input-punctuation-level' is 'FULL."
   :group 'zero-input
diff --git a/zero-input-pinyin.el b/zero-input-pinyin.el
index ca5f39213fafeb456b8134954f9898296a45faa7..47e4d9429958cfd20b335c336be4a2a4ee8585aa 100644
--- a/zero-input-pinyin.el
+++ b/zero-input-pinyin.el
@@ -18,7 +18,7 @@
 ;;
 ;;   (add-to-list 'load-path "~/fromsource/zero")  ;; omit if install from melpa
 ;;   (require 'zero-input-pinyin)
-;;   (zero-input-set-default-im 'pinyin)
+;;   (zero-input-set-default-im "pinyin")
 ;;   ;; Now you may bind a key to zero-input-mode to make it easy to
 ;;   ;; switch on/off the input method.
 ;;   (global-set-key (kbd "<f5>") 'zero-input-mode)
diff --git a/zero-input.el b/zero-input.el
index 5fe7fca36690620ce4bce5b2aca74a20525b1cea..39e251e77943e0f83bd5f88c591162fd6233f8da 100644
--- a/zero-input.el
+++ b/zero-input.el
@@ -12,7 +12,7 @@
 ;; See the License for the specific language governing permissions and
 ;; limitations under the License.
 
-;; Version: 2.6.0
+;; Version: 2.7.0
 ;; URL: https://gitlab.emacsos.com/sylecn/zero-el
 ;; Package-Requires: ((emacs "24.3") (s "1.2.0"))
 
@@ -251,7 +251,7 @@ If item is not in lst, return nil."
 
 ;; zero-input-el version
 (defvar zero-input-version nil "Zero package version.")
-(setq zero-input-version "2.6.0")
+(setq zero-input-version "2.7.0")
 
 ;; FSM state
 (defconst zero-input--state-im-off 'IM-OFF)
@@ -310,6 +310,7 @@ independent from punctuation map.  You can change this via
     (?^ "……")
     (?~ "～")
     (?\; "；")
+    (?\` "·")
     (?$ "￥"))
   "Additional punctuation map used when `zero-input-punctuation-level' is 'FULL."
   :group 'zero-input