diff --git a/go/append-characters-to-string-to-make-subsequence.go b/go/append-characters-to-string-to-make-subsequence.go
new file mode 100644
index 0000000..79ad4a1
--- /dev/null
+++ b/go/append-characters-to-string-to-make-subsequence.go
@@ -0,0 +1,14 @@
+package append_characters_to_string_to_make_subsequence
+
+func appendCharacters(s string, t string) int {
+	si, ti := 0, 0
+
+	for si < len(s) && ti < len(t) {
+		if s[si] == t[ti] {
+			ti++
+		}
+		si++
+	}
+
+	return len(t) - ti
+}