diff --git a/conf/command.conf b/conf/command.conf
index 750187a..da17dc1 100644
--- a/conf/command.conf
+++ b/conf/command.conf
@@ -1,65 +1,83 @@
 # CustomCommand section must be defined before Latency monitor to support all commands
 #
 # NOTE: only support maximum 16 custom commands
+#
+# [...] must be specify
+# (...) optional. it has default value
+#
+# CustomCommand [alias1] {   ## module alias. just a delimter
+#    [command1] {            ## command string, must be lower case. i.e. setnx, expire, ...
+#        (minArgs) (val)     ## minimum arguments(including command itself). default is 2(key only)
+#        (maxArgs) (val)     ## maximum arguments(including command itself). default is 2(key only)
+#        (mode) (val)        ## a command mode Read/Write/Admin is exclusive. default is Write.
+#    }
+#    [command2] {
+#        ...
+#    }
+#    ...
+# }
+#
+# default key position is first parameter. i.e. command1 key ...
+# if you want to use other position, add KeyAt2(key is second) or KeyAt3(key is third) to mode with '|'
+# i.e. mode Write|KeyAt2
+#
+# in case of 'mode KeyAt2', it will resolved as Write|KeyAt2
 
-CustomCommand {
-    # from redis source src/modules/hello.c
+# from redis source src/modules/hello.c
+CustomCommand hello {
     # hello.push.native key value
-    hello.push.native {  # name of command, must be lowercase.
-                         # key parameter is located at first argument. i.e. command key ...
-                         # Currently support only 1 key with first argument.
-        minArgs 3        # minimum arguments(including command itself), default is 2(key only)
-        maxArgs 3        # maximum arguments(including command itself), default is 2(key only)
-        mode Write       # a command mode Read/Write/Admin is exclusive, default is Write
+    hello.push.native {
+        minArgs 3
+        maxArgs 3
+        mode Write
     }
     # hello.repl2 <list-key>
     # just skipped since minArgs = 2, maxArgs = 2, mode = Write are default values
     hello.repl2 {
     }
     # hello.toggle.case key
+    # same as hello.repl2
     hello.toggle.case {
-        mode Write
     }
     # hello.more.expire key milliseconds
     hello.more.expire {
         minArgs 3
         maxArgs 3
-        mode Write
     }
     # hello.zsumrange key startscore endscore
     hello.zsumrange {
         minArgs 4
         maxArgs 4
-        mode Write
+        mode Read
     }
     # hello.lexrange key min_lex max_lex min_age max_age
     hello.lexrange {
         minArgs 6
         maxArgs 6
-        mode Write
+        mode Read
     }
     # hello.hcopy key srcfield dstfield
     hello.hcopy {
         minArgs 4
         maxArgs 4
-        mode Write
     }
+}
 
-    # from redis source src/modules/hellotype.c
+# from redis source src/modules/hellotype.c
+CustomCommand hellotype {
     # hellotype.insert key value
-    hello.insert {
+    hellotype.insert {
         minArgs 3
         maxArgs 3
-        mode Write
     }
     # hellotype.range key first count
     hellotype.range {
         minArgs 4
         maxArgs 4
-        mode Write
+        mode Read
     }
     # hellotype.len key
     hello.len {
-        mode Write
+        mode Read
     }
 }
diff --git a/src/Conf.cpp b/src/Conf.cpp
index 6772f61..df406af 100644
--- a/src/Conf.cpp
+++ b/src/Conf.cpp
@@ -380,9 +380,6 @@ void Conf::setCustomCommand(const ConfParser::Node* node)
         auto& cc = mCustomCommands.back();
         CustomCommandConf::init(cc, p->key.c_str(), Command::Sentinel);
         auto s = p->sub;
-        if (!s) {
-            Throw(InvalidValue, "%s:%d CustomCommand.Command require scope value", node->file, node->line);
-        }
         for (;s ; s = s->next) {
             if (setInt(cc.cmd.minArgs, "minArgs", s, 2)) {
             } else if (setInt(cc.cmd.maxArgs, "maxArgs", s, 2, 9999)) {
@@ -405,18 +402,14 @@ bool Conf::setCommandMode(int& mode, const char* name, const ConfParser::Node* n
         mode = defaultMode;
     } else {
         mode = 0;
-        int used = 0;
         std::string mask;
         std::istringstream is(n->val);
-        while (std::getline(is, mask, ',')) {
+        while (std::getline(is, mask, '|')) {
             if ((strcasecmp(mask.c_str(), "Write") == 0)) {
-                used++;
                 mode |= Command::Write;
             } else if ((strcasecmp(mask.c_str(), "Read") == 0)) {
-                used++;
                 mode |= Command::Read;
             } else if ((strcasecmp(mask.c_str(), "Admin") == 0)) {
-                used++;
                 mode |= Command::Admin;
             } else if ((strcasecmp(mask.c_str(), "KeyAt2") == 0)) {
                 mode |= Command::KeyAt2;
@@ -426,10 +419,24 @@ bool Conf::setCommandMode(int& mode, const char* name, const ConfParser::Node* n
                 Throw(InvalidValue, "%s:%d unknown mode %s", n->file, n->line, mask.c_str());
             }
         }
-        if (used == 0) {
-            Throw(InvalidValue, "%s:%d %s command require exclusive mode", n->file, n->line, name);
-        } else if (used > 1) {
-            Throw(InvalidValue, "%s:%d %s command duplicated exclusive mode", n->file, n->line, name);
+        switch (mode & Command::KeyMask) {
+        case 0:
+        case Command::KeyAt2:
+        case Command::KeyAt3:
+             break;
+        default:
+             Throw(InvalidValue, "%s:%d %s require exclusive key pos", n->file, n->line, name);
+        }
+        switch (mode & Command::AuthMask) {
+        case 0:
+            mode |= Command::Write;
+            break;
+        case Command::Read:
+        case Command::Write:
+        case Command::Admin:
+            break;
+        default:
+            Throw(InvalidValue, "%s:%d %s require exclusive mode", n->file, n->line, name);
         }
     }
     return true;
diff --git a/src/LatencyMonitor.h b/src/LatencyMonitor.h
index 866a400..55dc3a3 100644
--- a/src/LatencyMonitor.h
+++ b/src/LatencyMonitor.h
@@ -98,7 +98,7 @@ public:
     Buffer* output(Buffer* buf) const;
 private:
     String mName;
-    const std::bitset<Command::Sentinel>* mCmds;
+    const std::bitset<Command::AvailableCommands>* mCmds;
     std::vector<TimeSpan> mTimeSpan;
     TimeSpan mLast;
 };