-Linux is a flavor of Unix, and as a first approximation
-all user commands under Unix work precisely the same under
-Linux (and FreeBSD and lots of other Unix-like systems).
-.LP
-Under Linux there are GUIs (graphical user interfaces), where you
+Section 1 of the manual describes user commands and tools,
+for example, file manipulation tools, shells, compilers,
+web browsers, file and image viewers and editors, and so on.
+.SH NOTES
+Linux is a flavor of UNIX, and as a first approximation
+all user commands under UNIX work precisely the same under
+Linux (and FreeBSD and lots of other UNIX-like systems).
+.PP
+Under Linux, there are GUIs (graphical user interfaces), where you