diff --git a/makensis.fish b/makensis.fish
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+++ b/makensis.fish
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+# System to create Windows installers
+# See: https://nsis.sourceforge.io
+
+complete -c makensis -o CMDHELP -d 'Prints out help for a specific command, or lists all commands'
+complete -c makensis -o INPUTCHARSET -a 'ACP OEM UTF8 UTF16LE UTF16BE' -d 'Specifies input charset'
+complete -c makensis -o OUTPUTCHARSET -a 'ACP OEM UTF8 UTF8SIG UTF16LE UTF16BE UTF16LEBOM UTF16BEBOM' -d 'Specifies output charset'
+complete -c makensis -o LICENSE -d 'Prints the makensis software license'
+complete -c makensis -o NOCD -d 'Disables the current directory change to that of the .nsi file'
+complete -c makensis -o NOCONFIG -d 'Disables inclusion of <path to makensis.exe>/nsisconf.nsh'
+complete -c makensis -o P0 -d 'Sets the compiler process priority to idle'
+complete -c makensis -o P1 -d 'Sets the compiler process priority to below normal'
+complete -c makensis -o P2 -d 'Sets the compiler process priority to normal'
+complete -c makensis -o P3 -d 'Sets the compiler process priority to above normal'
+complete -c makensis -o P4 -d 'Sets the compiler process priority to high'
+complete -c makensis -o P5 -d 'Sets the compiler process priority to realtime'
+complete -c makensis -o PAUSE -d 'Pauses after execution'
+complete -c makensis -o PPO -d 'Preprocess to stdout/file'
+complete -c makensis -o SAFEPPO -d 'Preprocess to stdout/file'
+complete -c makensis -o V0 -d 'Verbosity: none'
+complete -c makensis -o V1 -d 'Verbosity: no warnings'
+complete -c makensis -o V2 -d 'Verbosity: no info'
+complete -c makensis -o V3 -d 'Verbosity: no script'
+complete -c makensis -o V4 -d 'Verbosity: all'
+complete -c makensis -o VERSION -d 'Prints the makensis version and exits'
+complete -c makensis -o WX -d 'Treat warnings as errors'