diff --git a/runtime/tools/blink.c b/runtime/tools/blink.c
new file mode 100644
index 0000000..1ffd848
--- /dev/null
+++ b/runtime/tools/blink.c
@@ -0,0 +1,21 @@
+/*
+ * An extremely simple program to make the cursor blink in an xterm.
+ * This is useful when the cursor is hard to spot in a highlighted file.
+ * Start in the background: "blink&"  Stop by killing it.
+ * Bram Moolenaar  980109  (based on an idea from John Lange).
+ */
+
+#include <stdio.h>
+
+main()
+{
+	while (1)
+	{
+		printf("\e[?25h");
+		fflush(stdout);
+		usleep(400000);		/* on time */
+		printf("\e[?25l");
+		fflush(stdout);
+		usleep(250000);		/* off time */
+	}
+}