diff --git a/usr.bin/procstat/procstat.1 b/usr.bin/procstat/procstat.1
index 98a78b0a0522..d6d30d5374be 100644
--- a/usr.bin/procstat/procstat.1
+++ b/usr.bin/procstat/procstat.1
@@ -112,3 +112,7 @@ It therefore does not work for file systems
 that do not use the name cache, such as
 .Xr devfs 4 ,
 or if the name is not present in the cache due to removal.
+.Pp
+.Nm
+currently supports extracting data only from a live kernel, and not from
+kernel crash dumps.