diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index d43ae35c00..6a3d0610a2 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,8 @@
+2017-07-31  Simon Marchi  <simon.marchi@ericsson.com>
+
+	* agentexpr.texi (rot): Fix symbolic description, improve
+	textual description.
+
 2017-07-26  Yao Qi  <yao.qi@linaro.org>
 
 	* gdb.texinfo (Maintenance Commands): Document command
diff --git a/gdb/doc/agentexpr.texi b/gdb/doc/agentexpr.texi
index 5668e9c1e4..081e5fa68b 100644
--- a/gdb/doc/agentexpr.texi
+++ b/gdb/doc/agentexpr.texi
@@ -396,8 +396,10 @@ is zero, this is the same as @code{dup}; if @var{n} is one, it copies
 the item under the top item, etc.  If @var{n} exceeds the number of
 items on the stack, terminate with an error.
 
-@item @code{rot} (0x33): @var{a} @var{b} @var{c} => @var{c} @var{b} @var{a}
-Rotate the top three items on the stack.
+@item @code{rot} (0x33): @var{a} @var{b} @var{c} => @var{c} @var{a} @var{b}
+Rotate the top three items on the stack.  The top item (c) becomes the third
+item, the next-to-top item (b) becomes the top item and the third item (a) from
+the top becomes the next-to-top item.
 
 @item @code{if_goto} (0x20) @var{offset}: @var{a} @result{}
 Pop an integer off the stack; if it is non-zero, branch to the given