diff --git a/Makefile b/Makefile
index 57debce..2578369 100644
--- a/Makefile
+++ b/Makefile
@@ -94,13 +94,26 @@ updrefbib:
 
 
 updextensions:
-	@if [ ! -d "_extensions/drwater/dwms" ]; then \
-		mkdir -p _extensions && \
-		git clone https://git.drwater.net/quarto/drwater.git _extensions/drwater; \
+	@echo "检查网络连通性..."; \
+	if ping -c 1 -W 1 drc.drwater.net > /dev/null 2>&1; then \
+		echo "网络正常，更新extensions..."; \
+		if [ ! -d "_extensions/drwater/dwms" ]; then \
+		  mkdir -p _extensions && \
+		  git clone https://git.drwater.net/quarto/drwater.git _extensions/drwater; \
+		else \
+		  cd _extensions/drwater && git pull && cd -; \
+		fi; \
+		echo "extensions更新完成."; \
 	else \
-		cd _extensions/drwater && git pull && cd -; \
+		echo "网络不可用，跳过extensions更新."; \
 	fi
 
+customslidestheme:
+	@echo "获取模版scss，用于自定义revealjs theme..."; \
+		cp ~/manuscript/su2023temp/_extensions/drwater/dwinst/slides.scss ./
+		echo "已复制到./slides.scss"; \
+		echo "请指定reveal format中的theme参数。如："; \
+		echo "format:\n  revealjs:\n    theme: slides.scss"
 
 check_git_status:
 	@uncommitted=$$(git status --porcelain); \