diff --git a/book/10-git-internals/sections/packfiles.asc b/book/10-git-internals/sections/packfiles.asc
index 349019678..d3d84fd4a 100644
--- a/book/10-git-internals/sections/packfiles.asc
+++ b/book/10-git-internals/sections/packfiles.asc
@@ -58,7 +58,7 @@ At this point, modify that file a little, and see what happens:
 [source,console]
 ----
 $ echo '# testing' >> repo.rb
-$ git commit -am 'modified repo a bit'
+$ git commit -am 'modified repo.rb a bit'
 [master 2431da6] modified repo.rb a bit
  1 file changed, 1 insertion(+)
 ----
diff --git a/diagram-source/progit.sketch b/diagram-source/progit.sketch
index d866bbe68..9b804c75c 100644
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diff --git a/images/reset-squash-r3.png b/images/reset-squash-r3.png
index 87e44cbed..9f5f9b2f5 100644
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