diff --git a/shchemes b/shchemes
index 62776dc..00996f5 100755
--- a/shchemes
+++ b/shchemes
@@ -170,6 +170,24 @@ ENDFILE  {
 	' "$path" > "$tmp" && mv "$tmp" "$path"
 }
 
+# TODO: multiple format support, check that line actually has multiple fields
+merge() {
+	path=$1
+	tmp=$(mktemp)
+
+	awk -F "=" '
+FILENAME == "-" {
+	a[$1] = $2
+	next
+}
+a[$1] {
+	print $1 "=" a[$1]
+	next
+}
+{ print }
+' - "$path" > "$tmp" && mv "$tmp" "$path"
+}
+
 convert_tinted_scheme() {
 	path=$1
 	tmp=$(mktemp)
@@ -247,6 +265,10 @@ if [ "$method" != "" ]; then
       inject "${args[1]}" "${args[2]}"
       ;;
 
+    merge)
+      merge "${args[1]}" "${args[2]}"
+      ;;
+
 	convert_tinted_template)
       convert_tinted_template "${args[1]}"
       ;;