diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index cc17783dd..0099ececf 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -1764,7 +1764,9 @@ the mmap buffer.
 .TP
 .IR aux_head ", " aux_tail ", " aux_offset ", " aux_size " (since Linux 4.1)"
 .\" commit 45bfb2e50471abbbfd83d40d28c986078b0d24ff
-The AUX region allows mmaping a separate sample buffer for
+The AUX region allows
+.BR mmap (2)-ing
+a separate sample buffer for
 high-bandwidth data streams (separate from the main perf sample buffer).
 An example of a high-bandwidth stream is instruction tracing support,
 as is found in newer Intel processors.