diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index da71c30a8..a4cf071ec 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -1091,7 +1091,7 @@ Branch not in transactional memory transaction.
 
 .TP
 .IR "sample_regs_user" " (Since Linux 3.7)"
-This bitmask defines the set of user CPU registers to dump on samples.
+This bit mask defines the set of user CPU registers to dump on samples.
 The layout of the register mask is architecture specific and
 described in the kernel header
 .IR arch/ARCH/include/uapi/asm/perf_regs.h .
@@ -1846,7 +1846,7 @@ the
 attr field.
 The number of values is the number of bits set in the
 .I sample_regs_user
-bitmask.
+bit mask.
 .TP
 .IR size ", " data[size] ", " dyn_size
 If