diff --git a/man5/proc.5 b/man5/proc.5
index 213fc004e..48d0b5e06 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2265,6 +2265,9 @@ This is just the pages which
 count toward text, data, or stack space.
 This does not include pages
 which have not been demand-loaded in, or which are swapped out.
+This value is inaccurate; see
+.I /proc/[pid]/statm
+below.
 .TP
 (25) \fIrsslim\fP \ %lu
 Current soft limit in bytes on the rss of the process;
@@ -2409,10 +2412,11 @@ The columns are:
 size       (1) total program size
            (same as VmSize in \fI/proc/[pid]/status\fP)
 resident   (2) resident set size
-           (same as VmRSS in \fI/proc/[pid]/status\fP)
+           (inaccurate; same as VmRSS in \fI/proc/[pid]/status\fP)
 shared     (3) number of resident shared pages
            (i.e., backed by a file)
-           (same as RssFile+RssShmem in \fI/proc/[pid]/status\fP)
+           (inaccurate; same as RssFile+RssShmem in
+           \fI/proc/[pid]/status\fP)
 text       (4) text (code)
 .\" (not including libs; broken, includes data segment)
 lib        (5) library (unused since Linux 2.6; always 0)
@@ -2421,6 +2425,16 @@ data       (6) data + stack
 dt         (7) dirty pages (unused since Linux 2.6; always 0)
 .EE
 .in
+.IP
+.\" See SPLIT_RSS_COUNTING in the kernel.
+.\" Inaccuracy is bounded by TASK_RSS_EVENTS_THRESH.
+Some of these values are inaccurate because
+of a kernel-internal scalability optimization.
+If accurate values are required, use
+.I /proc/[pid]/smaps
+or
+.I /proc/[pid]/smaps_rollup
+instead, which are much slower but provide accurate, detailed information.
 .TP
 .I /proc/[pid]/status
 Provides much of the information in
@@ -2597,6 +2611,9 @@ directly access physical memory.
 .TP
 .IR VmHWM
 Peak resident set size ("high water mark").
+This value is inaccurate; see
+.I /proc/[pid]/statm
+above.
 .TP
 .IR VmRSS
 Resident set size.
@@ -2605,16 +2622,25 @@ Note that the value here is the sum of
 .IR RssFile ,
 and
 .IR RssShmem .
+This value is inaccurate; see
+.I /proc/[pid]/statm
+above.
 .TP
 .IR RssAnon
 Size of resident anonymous memory.
 .\" commit bf9683d6990589390b5178dafe8fd06808869293
 (since Linux 4.5).
+This value is inaccurate; see
+.I /proc/[pid]/statm
+above.
 .TP
 .IR RssFile
 Size of resident file mappings.
 .\" commit bf9683d6990589390b5178dafe8fd06808869293
 (since Linux 4.5).
+This value is inaccurate; see
+.I /proc/[pid]/statm
+above.
 .TP
 .IR RssShmem
 Size of resident shared memory (includes System V shared memory,
@@ -2626,6 +2652,9 @@ and shared anonymous mappings).
 .TP
 .IR VmData ", " VmStk ", " VmExe
 Size of data, stack, and text segments.
+This value is inaccurate; see
+.I /proc/[pid]/statm
+above.
 .TP
 .IR VmLib
 Shared library code size.
@@ -2641,6 +2670,9 @@ Size of second-level page tables (added in Linux 4.0; removed in Linux 4.15).
 .\" commit b084d4353ff99d824d3bc5a5c2c22c70b1fba722
 Swapped-out virtual memory size by anonymous private pages;
 shmem swap usage is not included (since Linux 2.6.34).
+This value is inaccurate; see
+.I /proc/[pid]/statm
+above.
 .TP
 .IR HugetlbPages
 Size of hugetlb memory portions