diff --git a/docs/profiling.txt b/docs/profiling.txt
new file mode 100644
index 000000000..538d419ff
--- /dev/null
+++ b/docs/profiling.txt
@@ -0,0 +1,3 @@
+
+To enable procentry(char *name) and procexit(char *name) calls in ack: -Rcem-p
+