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2 changes: 1 addition & 1 deletion book/01-introduction/sections/about-version-control.asc
Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ To deal with this issue, programmers long ago developed local VCSs that had a si
.Local version control.
image::images/local.png[Local version control diagram]

One of the more popular VCS tools was a system called RCS, which is still distributed with many computers today.
One of the most popular VCS tools was a system called RCS, which is still distributed with many computers today.
RCS works by keeping patch sets (that is, the differences between files) in a special format on disk; it can then re-create what any file looked like at any point in time by adding up all the patches.

==== Centralized Version Control Systems
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