diff --git a/config/lean.zsh b/config/lean.zsh
index ff8fee08..7c31b7c5 100644
--- a/config/lean.zsh
+++ b/config/lean.zsh
@@ -9,6 +9,7 @@ fi
   emulate -L zsh
   setopt no_unset
 
+  # The list of segments shown on the left. Fill it with the most important segments.
   typeset -ga POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(
       # Line #1
       dir          # current directory
@@ -18,6 +19,10 @@ fi
       prompt_char  # prompt symbol
   )
 
+  # The list of segments shown on the right. Fill it with less important segments.
+  # Right prompt on the last prompt line (where you are typing your commands) gets
+  # automatically hidden when the input line reaches it. Right prompt above the
+  # last prompt line gets hidden if it would overlap with left prompt.
   typeset -ga POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(
       status                  # exit code of the last command
       command_execution_time  # duration of the last command
@@ -44,19 +49,19 @@ fi
   typeset -g POWERLEVEL9K_{LEFT,RIGHT}_SUBSEGMENT_SEPARATOR=' '
   typeset -g POWERLEVEL9K_{LEFT,RIGHT}_SEGMENT_SEPARATOR=
 
-  # Don't add an empty line before each prompt. If you set it to true, you'll probably
-  # want to set POWERLEVEL9K_SHOW_RULER=false below.
-  typeset -g POWERLEVEL9K_PROMPT_ADD_NEWLINE=false
+  # Add an empty line before each prompt. If you set it to false, you might want to
+  # set POWERLEVEL9K_SHOW_RULER to true below.
+  typeset -g POWERLEVEL9K_PROMPT_ADD_NEWLINE=true
 
-  # Add a horizontal line before each prompt. If you set it to false, you might want to
-  # set POWERLEVEL9K_PROMPT_ADD_NEWLINE=true above.
-  typeset -g POWERLEVEL9K_SHOW_RULER=true
+  # Ruler, a.k.a. the horizontal line before each prompt. If you set it to true, you'll
+  # probably want to set POWERLEVEL9K_PROMPT_ADD_NEWLINE to false above.
+  typeset -g POWERLEVEL9K_SHOW_RULER=false
   typeset -g POWERLEVEL9K_RULER_CHAR='─'
   typeset -g POWERLEVEL9K_RULER_FOREGROUND=237
 
-  # Green prompt symbol on success ($? == 0).
+  # Green prompt symbol if the last command succeeded.
   typeset -g POWERLEVEL9K_PROMPT_CHAR_OK_{VIINS,VICMD,VIVIS}_FOREGROUND=76
-  # Red prompt symbol on error ($? != 0).
+  # Red prompt symbol if the last command failed.
   typeset -g POWERLEVEL9K_PROMPT_CHAR_ERROR_{VIINS,VICMD,VIVIS}_FOREGROUND=196
   # Default prompt symbol.
   typeset -g POWERLEVEL9K_PROMPT_CHAR_{OK,ERROR}_VIINS_CONTENT_EXPANSION='❯ '
@@ -65,46 +70,52 @@ fi
   # Prompt symbol in visual vi mode.
   typeset -g POWERLEVEL9K_PROMPT_CHAR_{OK,ERROR}_VIVIS_CONTENT_EXPANSION='Ⅴ '
 
+  # Enable special styling for non-writable directories. If set to false,
+  # POWERLEVEL9K_DIR_NOT_WRITABLE_FOREGROUND defined below won't have effect.
+  typeset -g POWERLEVEL9K_DIR_SHOW_WRITABLE=true
   # Default current directory color.
   typeset -g POWERLEVEL9K_DIR_FOREGROUND=39
   # Directory color if it isn't writable.
   typeset -g POWERLEVEL9K_DIR_NOT_WRITABLE_FOREGROUND=209
-  # Embed a hyperlink into the directory.
-  typeset -g POWERLEVEL9K_DIR_HYPERLINK=true
-  # Enable special styling for non-writable directories. If set to false,
-  # POWERLEVEL9K_DIR_NOT_WRITABLE_FOREGROUND defined above won't have effect.
-  typeset -g POWERLEVEL9K_DIR_SHOW_WRITABLE=true
-
-  # Git status: feature:master#tag ⇣42⇡42 *42 merge ~42 +42 !42 ?42
+  # If set to true, embed a hyperlink into the directory. Useful for quickly
+  # opening a directory in the file manager simply by clicking the link.
+  # Can also be handy when the directory is shortened, as it allows you to see
+  # the full directory that was used in previous commands.
+  typeset -g POWERLEVEL9K_DIR_HYPERLINK=false
+
+  # Git status: feature:master#tag ⇣42⇡42 *42 merge ~42 +42 !42 ?42.
+  # We are using parameters defined by the gitstatus plugin. See reference:
+  # https://github.com/romkatv/gitstatus/blob/master/gitstatus.plugin.zsh.
   local vcs=''
-  # 'feature' or '@72f5c8a' if not on a branch
+  # 'feature' or '@72f5c8a' if not on a branch.
   vcs+='%76F${${VCS_STATUS_LOCAL_BRANCH//\%/%%}:-%f@%76F${VCS_STATUS_COMMIT[1,8]}}'
-  # ':master' if the tracking branch name differs from local branch
+  # ':master' if the tracking branch name differs from local branch.
   vcs+='${${VCS_STATUS_REMOTE_BRANCH:#$VCS_STATUS_LOCAL_BRANCH}:+%f:%76F${VCS_STATUS_REMOTE_BRANCH//\%/%%}}'
-  # '#tag' if on a tag
+  # '#tag' if on a tag.
   vcs+='${VCS_STATUS_TAG:+%f#%76F${VCS_STATUS_TAG//\%/%%}}'
-  # ⇣42 if behind the remote
+  # ⇣42 if behind the remote.
   vcs+='${${VCS_STATUS_COMMITS_BEHIND:#0}:+ %76F⇣${VCS_STATUS_COMMITS_BEHIND}}'
-  # ⇡42 if ahead of the remote; no leading space if also behind the remote: ⇣42⇡42
+  # ⇡42 if ahead of the remote; no leading space if also behind the remote: ⇣42⇡42.
+  # If you want '⇣42 ⇡42' instead, replace '${${(M)VCS_STATUS_COMMITS_BEHIND:#0}:+ }' with ' '.
   vcs+='${${VCS_STATUS_COMMITS_AHEAD:#0}:+${${(M)VCS_STATUS_COMMITS_BEHIND:#0}:+ }%76F⇡${VCS_STATUS_COMMITS_AHEAD}}'
-  # *42 if have stashes
+  # *42 if have stashes.
   vcs+='${${VCS_STATUS_STASHES:#0}:+ %76F*${VCS_STATUS_STASHES}}'
-  # 'merge' if the repo is in an unusual state
+  # 'merge' if the repo is in an unusual state.
   vcs+='${VCS_STATUS_ACTION:+ %196F${VCS_STATUS_ACTION//\%/%%}}'
-  # ~42 if have merge conflicts
+  # ~42 if have merge conflicts.
   vcs+='${${VCS_STATUS_NUM_CONFLICTED:#0}:+ %196F~${VCS_STATUS_NUM_CONFLICTED}}'
-  # +42 if have staged changes
+  # +42 if have staged changes.
   vcs+='${${VCS_STATUS_NUM_STAGED:#0}:+ %11F+${VCS_STATUS_NUM_STAGED}}'
-  # !42 if have unstaged changes
+  # !42 if have unstaged changes.
   vcs+='${${VCS_STATUS_NUM_UNSTAGED:#0}:+ %11F!${VCS_STATUS_NUM_UNSTAGED}}'
-  # ?42 if have untracked files
+  # ?42 if have untracked files.
   vcs+='${${VCS_STATUS_NUM_UNTRACKED:#0}:+ %12F?${VCS_STATUS_NUM_UNTRACKED}}'
   # If P9K_CONTENT is not empty, leave it unchanged. It's either "loading" or from vcs_info.
   vcs="\${P9K_CONTENT:-$vcs}"
 
   # Disable the default Git status formatting.
   typeset -g POWERLEVEL9K_VCS_DISABLE_GITSTATUS_FORMATTING=true
-  # Install our own Git status formatting.
+  # Install our own Git status formatter.
   typeset -g POWERLEVEL9K_VCS_{CLEAN,UNTRACKED,MODIFIED}_CONTENT_EXPANSION=$vcs
   # When Git status is being refreshed asynchronously, display the last known repo status in grey.
   typeset -g POWERLEVEL9K_VCS_LOADING_CONTENT_EXPANSION=${${vcs//\%f}//\%<->F}
@@ -112,9 +123,8 @@ fi
   # Enable counters for staged, unstaged, etc.
   typeset -g POWERLEVEL9K_VCS_{STAGED,UNSTAGED,UNTRACKED,COMMITS_AHEAD,COMMITS_BEHIND}_MAX_NUM=-1
 
-  # These settings have no effect when vcs prompt is rendered from gitstatusd data.
-  # They are used for respositories other than Git or when gitstatusd fails and Powerlevel10k
-  # has to fall back to using vcs_info.
+  # These settings are used for respositories other than Git or when gitstatusd fails and
+  # Powerlevel10k has to fall back to using vcs_info.
   typeset -g POWERLEVEL9K_VCS_CLEAN_FOREGROUND=76
   typeset -g POWERLEVEL9K_VCS_MODIFIED_FOREGROUND=11
   typeset -g POWERLEVEL9K_VCS_UNTRACKED_FOREGROUND=76
@@ -155,7 +165,7 @@ fi
   typeset -g POWERLEVEL9K_CONTEXT_FOREGROUND=244
   # Context color when running with privileges.
   typeset -g POWERLEVEL9K_CONTEXT_ROOT_FOREGROUND=11
-  # Don't show context unless running with privileges on in SSH.
+  # Don't show context unless running with privileges on via SSH.
   typeset -g POWERLEVEL9K_CONTEXT_{DEFAULT,SUDO}_CONTENT_EXPANSION=
   typeset -g POWERLEVEL9K_ALWAYS_SHOW_CONTEXT=true
 
@@ -163,38 +173,54 @@ fi
   typeset -g POWERLEVEL9K_VIRTUALENV_FOREGROUND=6
   # Show Python version next to the virtual environment name.
   typeset -g POWERLEVEL9K_VIRTUALENV_SHOW_PYTHON_VERSION=true
+  # Separate environment name from Python version only with a space.
   typeset -g POWERLEVEL9K_VIRTUALENV_{LEFT,RIGHT}_DELIMITER=
 
+  # Anaconda environment color.
   typeset -g POWERLEVEL9K_ANACONDA_FOREGROUND=6
+  # Show Python version next to the anaconda environment name.
   typeset -g POWERLEVEL9K_ANACONDA_SHOW_PYTHON_VERSION=true
+  # Separate environment name from Python version only with a space.
   typeset -g POWERLEVEL9K_ANACONDA_{LEFT,RIGHT}_DELIMITER=
 
-  typeset -g POWERLEVEL9K_PYENV_BACKGROUND=none
+  # Pyenv color.
   typeset -g POWERLEVEL9K_PYENV_FOREGROUND=6
+  # Don't show the current Python version if it's the same as global.
   typeset -g POWERLEVEL9K_PYENV_PROMPT_ALWAYS_SHOW=false
 
-  # Don't show trailing "/default" in kubernetes context.
-  typeset -g POWERLEVEL9K_KUBECONTEXT_SHOW_DEFAULT_NAMESPACE=false
-  # Kubernetes context classes for the purpose of using different colors with different contexts.
+  # Kubernetes context classes for the purpose of using different colors with
+  # different contexts.
   #
-  # POWERLEVEL9K_KUBECONTEXT_CLASSES is an array with even number of elements. The first element in
-  # each pair defines a pattern against which the current kubernetes context (in the format it is
-  # displayed in the prompt) gets matched. The second element defines the context class. Patterns
-  # are tried in order. The first match wins.
+  # POWERLEVEL9K_KUBECONTEXT_CLASSES is an array with even number of elements.
+  # The first element in each pair defines a pattern against which the current
+  # kubernetes context (in the format it is displayed in the prompt) gets matched.
+  # The second element defines the context class. Patterns are tried in order.
+  # The first match wins.
   #
-  # For example, if your current kubernetes context is "deathray-testing", its class is TEST because
-  # "deathray-testing" doesn't match the pattern '*prod*' but does match '*test*'. Hence it'll be
-  # shown with the color of $POWERLEVEL9K_KUBECONTEXT_TEST_FOREGROUND.
+  # For example, if your current kubernetes context is "deathray-testing", its
+  # class is TEST because "deathray-testing" doesn't match the pattern '*prod*'
+  # but does match '*test*'. Hence it'll be shown with the color of
+  # $POWERLEVEL9K_KUBECONTEXT_TEST_FOREGROUND.
   typeset -g POWERLEVEL9K_KUBECONTEXT_CLASSES=(
-      '*prod*'  PROD
-      '*test*'  TEST
+      # '*prod*'  PROD    # These values are examples that are unlikely
+      # '*test*'  TEST    # to match your needs. Customize them as needed.
       '*'       DEFAULT)
-  typeset -g POWERLEVEL9K_KUBECONTEXT_PROD_FOREGROUND=1
-  typeset -g POWERLEVEL9K_KUBECONTEXT_TEST_FOREGROUND=2
+  # typeset -g POWERLEVEL9K_KUBECONTEXT_PROD_FOREGROUND=1
+  # typeset -g POWERLEVEL9K_KUBECONTEXT_TEST_FOREGROUND=2
   typeset -g POWERLEVEL9K_KUBECONTEXT_DEFAULT_FOREGROUND=3
-
+  # Kubernetes too long? You can shorten it by defining an expansion. The original
+  # Kubernetes context that you see in your prompt is stored in ${P9K_CONTENT} when
+  # the expansion is evaluated. To remove everything up to and including the last '/',
+  # set POWERLEVEL9K_KUBECONTEXT_CONTENT_EXPANSION='${P9K_CONTENT##*/}'. Parameter
+  # expansions are flexible and fast. See reference:
+  # http://zsh.sourceforge.net/Doc/Release/Expansion.html#Parameter-Expansion.
+  typeset POWERLEVEL9K_KUBECONTEXT_CONTENT_EXPANSION='${P9K_CONTENT}'
+  # Show the trailing "/default" in kubernetes context.
+  typeset -g POWERLEVEL9K_KUBECONTEXT_SHOW_DEFAULT_NAMESPACE=true
+
+  # Current time color.
   typeset -g POWERLEVEL9K_TIME_FOREGROUND=66
-  # Format for the time segment: 09:51:02. See `man 3 strftime`.
+  # Format for the current time: 09:51:02. See `man 3 strftime`.
   typeset -g POWERLEVEL9K_TIME_FORMAT='%D{%H:%M:%S}'
 }