diff --git a/src/lib.zig b/src/lib.zig
index 94f8cf6d11e074959e72f291eb33beb7b313578a..b3b361a276f620a8bee6443ebe4daedba46ffee8 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -814,3 +814,22 @@ pub fn sum(comptime T: type, slice: []const T) T {
     for (slice) |item| res += item;
     return res;
 }
+
+pub fn RingBuffer(comptime T: type, comptime capacity: usize) type {
+    return struct {
+        items: [capacity]T = undefined,
+        len: usize = 0,
+        comptime capacity: usize = capacity,
+
+        const Self = @This();
+
+        pub fn append(self: *Self, new_item: T) void {
+            if (self.len == self.capacity) {
+                for (1..self.len) |i| self.items[i - 1] = self.items[i];
+                self.len -= 1;
+            }
+            self.items[self.len] = new_item;
+            self.len += 1;
+        }
+    };
+}