> For the complete documentation index, see [llms.txt](https://ploegert.gitbook.io/til/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ploegert.gitbook.io/til/tools/vim/breaking-the-undo-sequence.md). # Breaking The Undo Sequence Generally, the sequence of undo-able actions is segmented by command. When entering Insert mode, everything typed until exiting Insert mode is part of a single undo-able segment. If you are going to be typing in Insert mode for a while though, you may want to break it up a bit. Without leaving Insert mode, hit `ctrl-g u` to mark a break in the sequence of undos. For example, starting in Normal mode and then typing `iabcudefughi` will leave the buffer with: ``` abcdefghi ``` Hitting `u` once will leave the buffer with: ``` abcdef ``` Hitting `u` again: ``` abc ``` Hitting `ctrl-r`: ``` abcdef ``` See `:h i_CTRL-G_u` for more details. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://ploegert.gitbook.io/til/tools/vim/breaking-the-undo-sequence.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.