diff --git a/trunk/auto/depends.sh b/trunk/auto/depends.sh
index 18b88598a..5175c6957 100755
--- a/trunk/auto/depends.sh
+++ b/trunk/auto/depends.sh
@@ -540,9 +540,10 @@ fi
 # srtp
 #####################################################################################
 if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
-    SRTP_CONFIG="echo 'SRTP without openssl'" && SRTP_OPTIONS=""
+    SRTP_CONFIG="echo SRTP without openssl(ASM) optimization" && SRTP_OPTIONS=""
     # If use ASM for SRTP, we enable openssl(with ASM).
     if [[ $SRS_SRTP_ASM == YES ]]; then
+        echo "SRTP with openssl(ASM) optimization" &&
         SRTP_CONFIG="export PKG_CONFIG_PATH=../openssl/lib/pkgconfig" && SRTP_OPTIONS="--enable-openssl"
     fi
     # Patched ST from https://github.com/ossrs/state-threads/tree/srs
diff --git a/trunk/configure b/trunk/configure
index 855ade2fe..63e42986e 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -477,6 +477,10 @@ help:
 	@echo "To rebuild special module:"
 	@echo "     st              Rebuild st-srs in ${SRS_OBJS_DIR}/${SRS_PLATFORM}/st-srs"
 	@echo "     ffmpeg          Rebuild ffmpeg in ${SRS_OBJS}/${SRS_PLATFORM}/ffmpeg-4.2-fit"
+	@echo "To reconfigure special depends:"
+	@echo "     clean_openssl   Remove the openssl cache."
+	@echo "     clean_srtp2     Remove the libsrtp2 cache."
+	@echo "     clean_opus      Remove the opus cache."
 	@echo "For example:"
 	@echo "     make"
 	@echo "     make help"
@@ -505,12 +509,15 @@ clean_modules:
 
 clean_openssl:
 	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM} && rm -rf openssl*)
+	@echo "Please rebuild openssl by: ./configure"
 
 clean_srtp2:
 	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM} && rm -rf libsrtp-2.0.0)
+	@echo "Please rebuild libsrtp2 by: ./configure"
 
 clean_opus:
 	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM} && rm -rf opus-1.3.1)
+	@echo "Please rebuild opus by: ./configure"
 
 clean_nginx:
 	(cd ${SRS_OBJS_DIR} && rm -rf nginx)
@@ -522,10 +529,12 @@ clean_cherrypy:
 st:
 	(cd ${SRS_OBJS_DIR} && rm -f srs srs_utest)
 	(cd ${SRS_OBJS_DIR}/${SRS_PLATFORM}/st-srs && \$(MAKE) ${_ST_MAKE} EXTRA_CFLAGS="${_ST_EXTRA_CFLAGS}")
+	@echo "Please rebuild srs by: rm -f objs/srs && make"
 
 ffmpeg:
 	(cd ${SRS_OBJS_DIR} && rm -f srs srs_utest)
 	(cd ${SRS_OBJS}/${SRS_PLATFORM}/ffmpeg-4.2-fit && \$(MAKE) install-libs)
+	@echo "Please rebuild srs by: rm -f objs/srs && make"
 
 END