diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 2271d486a..e0ed138b6 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "220"
+#define VERSION_REVISION "221"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 1e82ed8ec..ab0a0deb9 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -190,6 +190,12 @@ int main(int argc, char** argv)
     
     // features
     show_macro_features();
+
+    // for special features.
+#ifdef SRS_AUTO_HTTP_SERVER
+    srs_warn("http server is dev feature, "
+        "@see https://github.com/winlinvip/simple-rtmp-server/wiki/HTTPServer#feature");
+#endif
     
     /**
     * we do nothing in the constructor of server,