Update docs.

CHANGELOG.asciidoc

@@ -14,6 +14,15 @@ This project adheres to http://semver.org/[Semantic Versioning].
 // `Fixed` for any bug fixes.
 // `Security` to invite users to upgrade in case of vulnerabilities.
 
+v0.6.0 (unreleased)
+-------------------
+
+Added
+~~~~~
+
+- New `--quiet` argument for the `:debug-pyeval` command to not open a tab with
+  the results. Note `:debug-pyeval` is still only intended for debugging.
+
 v0.5.0
 ------
 

doc/help/commands.asciidoc

@@ -1266,13 +1266,16 @@ Dump the current page's content to a file.
 
 [[debug-pyeval]]
 === debug-pyeval
-Syntax: +:debug-pyeval 's'+
+Syntax: +:debug-pyeval [*--quiet*] 's'+
 
 Evaluate a python string and display the results as a web page.
 
 ==== positional arguments
 * +'s'+: The string to evaluate.
 
+==== optional arguments
+* +*-q*+, +*--quiet*+: Don't show the output in a new tab.
+
 ==== note
 * This command does not split arguments after the last argument and handles quotes literally.
 * With this command, +;;+ is interpreted literally instead of splitting off a second command.