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+% LAGRANGE(1)
+% Jaakko Keränen (jaakko.keranen@iki.fi)
+% January 2022
+
+# NAME
+
+lagrange - a beautiful Gemini client
+
+# SYNOPSIS
+
+**lagrange** \[options\]\ \[_URL_\]...\ \[_FILE_\]...
+
+# DESCRIPTION
+
+Lagrange is a graphical client for the Gemini, Gopher, and Finger protocols.
+It offers modern conveniences familiar from web browsers, such as smooth scrolling, inline image viewing, multiple tabs, visual themes, Unicode fonts, and bookmarks.
+
+# OPTIONS
+
+When multiple URLs and/or local files are specified, they are opened in separate tabs.
+
+**-E**, **\--echo**
+:   Print all internal application events to stdout. Useful for debugging.
+
+**\--help**
+:   List the available command line options.
+
+**-u**, **\--url-or-search** _URL_ | _TEXT_
+:   Open a URL, or make a search query with given text. This only works if the search query URL has been configured.
+
+**-V**, **\--version**
+:   Output the version number.
+
+## Window options:
+
+**-h**, **\--height** _N_
+:   Set initial window height to _N_ pixels.
+
+**\--sw**
+:   Disable hardware-accelerated rendering.
+
+**-w**, **\--width** _N_
+:   Set initial window width to _N_ pixels.
+
+## Control options:
+
+These options are used to control the currently running Lagrange instance via the command line.
+
+**\--close-tab**
+:   Close the current tab.
+
+**-L**, **\--list-tab-urls**
+:   Print the URLs of open tabs to stdout. If the app isn't running, nothing is printed.
+
+**\--new-tab** [_URL_]
+:   Open a new tab. If the URL argument is omitted, the user's homepage is opened.
+
+**\--tab-url**
+:   Print the URL of the active tab.
+
+# ENVIRONMENT
+
+`LAGRANGE_OVERRIDE_DPI`
+:   Override the autodetected screen DPI with a user-provided value. Some window systems and/or monitors may not provide an appropriate DPI value, so this enables further tuning the UI scaling in addition to the "UI scale factor" found in Preferences.
+
+# FILES
+
+User-specific files such as bookmarks and navigation history are stored in the following operating system dependent locations:
+
+- Windows: "C:\\Users\\Name\\AppData\\Roaming\\fi.skyjake.Lagrange"
+- macOS: "~/Library/Application Support/fi.skyjake.Lagrange"
+- Other: "~/.config/lagrange" 
+
+The directory contains:
+
+**bindings.txt**
+:   Customized key bindings.
+
+**bookmarks.ini**
+:   Bookmarks in TOML format.
+
+**feeds.txt**
+:   State of subscribed feeds: all the known entries and latest update timestamps.
+
+**fonts.ini**
+:   Custom fonts to load at launch.
+
+**idents.lgr**
+:   Information about identities.
+
+**idents/**
+:   Subdirectory containing client certificates and private keys in PEM format.
+
+**modmap.txt**
+:   Customized keyboard modifier mapping.
+
+**mimehooks.txt**
+:   Configuration of external programs to filter page contents depending on MIME type.
+
+**palette.txt**
+:   Colors of the UI palette.
+
+**prefs.cfg**
+:   User's preferences. This is a list of UI events that gets executed at launch (cf. output of **\--echo**).
+
+**state.lgr**
+:   Serialized UI state, specifying open tabs and sidebar state.
+
+**sitespec.ini**
+:   Site-specific preferences in TOML format.
+
+**trusted.2.txt**
+:   Fingerprints of trusted server certificates.
+
+**visited.2.txt**
+:   List of visited URLs with timestamps.
+
+# STANDARDS
+
+* [Gemini Protocol Specification](https://gemini.circumlunar.space/docs/specification.gmi)
+* [Gempub Specification](https://codeberg.org/oppenlab/gempub)
+* [RFC 1436: The Internet Gopher Protocol](https://datatracker.ietf.org/doc/html/rfc1436)
+* [RFC 1288: The Finger User Information Protocol](https://datatracker.ietf.org/doc/html/rfc1288)
+
+# SEE ALSO
+
+Open "about:help" in the application to view the complete Help page.
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