| idm | Options.Applicative.Builder, Options.Applicative |
| indent | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| info | Options.Applicative.Builder, Options.Applicative |
| infoFailureCode | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| infoFooter | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| infoFullDesc | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| infoHeader | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| InfoMod | Options.Applicative.Builder, Options.Applicative |
| InfoMsg | Options.Applicative.Types, Options.Applicative.Internal, Options.Applicative.Builder, Options.Applicative |
| infoOption | Options.Applicative.Builder, Options.Applicative |
| infoParser | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| infoPolicy | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| infoProgDesc | Options.Applicative.Types, Options.Applicative.Common, Options.Applicative |
| Intensity | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| Internal | Options.Applicative.Types |
| internal | Options.Applicative.Builder.Internal, Options.Applicative.Builder, Options.Applicative |
| Intersperse | Options.Applicative.Types |
| IsCmdStart | Options.Applicative.Types |
| isEmpty | Options.Applicative.Help.Chunk, Options.Applicative.Help |
| isLongName | Options.Applicative.Types |
| isShortName | Options.Applicative.Types |
| Italicized | |
| 1 (Data Constructor) | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| 2 (Type/Class) | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| italicized | Options.Applicative.Help.Pretty, Options.Applicative.Help |