bpo-17535: IDLE editor line numbers (GH-14030)
diff --git a/Lib/idlelib/help.html b/Lib/idlelib/help.html
index cee6887..49068df 100644
--- a/Lib/idlelib/help.html
+++ b/Lib/idlelib/help.html
@@ -271,10 +271,15 @@
size, additional help sources, and extensions. On macOS, open the
configuration dialog by selecting Preferences in the application
menu. For more, see
-<a class="reference internal" href="#preferences"><span class="std std-ref">Setting preferences</span></a> under Help and preferences.</dd>
+<a class="reference internal" href="#preferences"><span class="std std-ref">Setting preferences</span></a> under Help and preferences.
+Most configuration options apply to all windows or all future windows.
+The option items below only apply to the active window.</dd>
<dt>Show/Hide Code Context (Editor Window only)</dt><dd>Open a pane at the top of the edit window which shows the block context
of the code which has scrolled above the top of the window. See
<a class="reference internal" href="#code-context"><span class="std std-ref">Code Context</span></a> in the Editing and Navigation section below.</dd>
+<dt>Line Numbers (Editor Window only)</dt><dd>Open a column to the left of the edit window which shows the linenumber
+of each line of text. The default is off unless configured on
+(see <a class="reference internal" href="#preferences"><span class="std std-ref">Setting preferences</span></a>).</dd>
<dt>Zoom/Restore Height</dt><dd>Toggles the window between normal size and maximum height. The initial size
defaults to 40 lines by 80 chars unless changed on the General tab of the
Configure IDLE dialog. The maximum height for a screen is determined by
@@ -607,7 +612,7 @@
will then be attached to that window for input and output.</p>
<p>The IDLE code running in the execution process adds frames to the call stack
that would not be there otherwise. IDLE wraps <code class="docutils literal notranslate"><span class="pre">sys.getrecursionlimit</span></code> and
-<code class="docutils literal notranslate"><span class="pre">sys.setrecursionlimit</span></code> to reduce their visibility.</p>
+<code class="docutils literal notranslate"><span class="pre">sys.setrecursionlimit</span></code> to reduce the effect of the additional stack frames.</p>
<p>If <code class="docutils literal notranslate"><span class="pre">sys</span></code> is reset by user code, such as with <code class="docutils literal notranslate"><span class="pre">importlib.reload(sys)</span></code>,
IDLE’s changes are lost and input from the keyboard and output to the screen
will not work correctly.</p>
@@ -895,7 +900,7 @@
<br />
<br />
- Last updated on Jul 04, 2019.
+ Last updated on Jul 23, 2019.
<a href="https://docs.python.org/3/bugs.html">Found a bug</a>?
<br />