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diff --git a/runtime/probes/test4/README b/runtime/probes/test4/README
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+Sample probe.
+
+This is a translation of on an old dtr probe:
+
+global {
+  long @opens[string];
+  sum @reads[string], @writes[string];
+}
+
+probe sys_open:entry {
+  @opens[current->comm]++;
+}
+
+probe sys_read:entry {
+  @reads[current->comm] << count;
+}
+
+probe sys_write:entry {
+  @writes[current->comm] << count;
+}