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diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 59445d0fad..a7d182ba84 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -484,6 +484,19 @@ Sakamoto, Yoshinori Sato, Michael Snyder, Andreas Schwab, Jason
 Thorpe, Corinna Vinschen, Ulrich Weigand, and Elena Zannoni, helped
 with the migration of old architectures to this new framework.
 
+Andrew Cagney completely re-designed and re-implemented @value{GDBN}'s
+unwinder framework, this consisting of a fresh new design featuring
+frame IDs, independent frame sniffers, and the sentinel frame.  Mark
+Kettenis implemented the @sc{dwarf 2} unwinder, Jeff Johnston the
+libunwind unwinder, and Andrew Cagney the dummy, sentinel, tramp, and
+trad unwinders.  The architecture specific changes, each involving a
+complete rewrite of the architecture's frame code, were carried out by
+Jim Blandy, Joel Brobecker, Kevin Buettner, Andrew Cagney, Stephane
+Carrez, Randolph Chung, Orjan Friberg, Richard Henderson, Daniel
+Jacobowitz, Jeff Johnston, Mark Kettenis, Theodore A. Roth, Kei
+Sakamoto, Yoshinori Sato, Michael Snyder, Corinna Vinschen, and Ulrich
+Weigand.
+
 @node Sample Session
 @chapter A Sample @value{GDBN} Session
 
@@ -5005,8 +5018,7 @@ is recorded as @file{../lib/foo.c}, @value{GDBN} would first try
 that---@file{/mnt/cross/foo.c}.
 
 Note that the executable search path is @emph{not} used to locate the
-source files.  Neither is the current working directory, unless it
-happens to be in the source path.
+source files.
 
 Whenever you reset or rearrange the source path, @value{GDBN} clears out
 any information it has cached about where source files are found and where
@@ -5048,7 +5060,7 @@ session, while the latter is immediately expanded to the current
 directory at the time you add an entry to the source path.
 
 @item directory
-Reset the source path to empty again.  This requires confirmation.
+Reset the source path to its default value (@samp{$cdir:$cwd} on Unix systems).  This requires confirmation.
 
 @c RET-repeat for @code{directory} is explicitly disabled, but since
 @c repeating it would be a no-op we do not say that.  (thanks to RMS)
@@ -5064,7 +5076,7 @@ versions of source.  You can correct the situation as follows:
 
 @enumerate
 @item
-Use @code{directory} with no argument to reset the source path to empty.
+Use @code{directory} with no argument to reset the source path to its default value.
 
 @item
 Use @code{directory} with suitable arguments to reinstall the
@@ -22555,7 +22567,7 @@ breakpoint at @var{addr}.
 Don't use this packet.  Use the @samp{Z} and @samp{z} packets instead
 (@pxref{insert breakpoint or watchpoint packet}).
 
-@item c @var{addr}
+@item c @r{[}@var{addr}@r{]}
 @cindex @samp{c} packet
 Continue.  @var{addr} is address to resume.  If @var{addr} is omitted,
 resume at current address.
@@ -22563,7 +22575,7 @@ resume at current address.
 Reply:
 @xref{Stop Reply Packets}, for the reply specifications.
 
-@item C @var{sig};@var{addr}
+@item C @var{sig}@r{[};@var{addr}@r{]}
 @cindex @samp{C} packet
 Continue with signal @var{sig} (hex signal number).  If
 @samp{;@var{addr}} is omitted, resume at same address.
@@ -22769,7 +22781,7 @@ This packet is only available in extended mode.
 
 The @samp{R} packet has no reply.
 
-@item s @var{addr}
+@item s @r{[}@var{addr}@r{]}
 @cindex @samp{s} packet
 Single step.  @var{addr} is the address at which to resume.  If
 @var{addr} is omitted, resume at same address.
@@ -22777,7 +22789,7 @@ Single step.  @var{addr} is the address at which to resume.  If
 Reply:
 @xref{Stop Reply Packets}, for the reply specifications.
 
-@item S @var{sig};@var{addr}
+@item S @var{sig}@r{[};@var{addr}@r{]}
 @anchor{step with signal packet}
 @cindex @samp{S} packet
 Step with signal.  This is analogous to the @samp{C} packet, but