diff --git a/book/10-git-internals/sections/objects.asc b/book/10-git-internals/sections/objects.asc
index 9600bf978..b786350cb 100644
--- a/book/10-git-internals/sections/objects.asc
+++ b/book/10-git-internals/sections/objects.asc
@@ -145,6 +145,15 @@ $ git cat-file -p 99f1a6d12cb4b6f19c8655fca46c3ecf317074e0
 100644 blob 47c6340d6459e05787f644c2447d2595f5d3a54b      simplegit.rb
 ----
 
+[NOTE]
+====
+Depending on what shell you use, you may encounter errors when using the `master^{tree}` syntax.
+
+In PowerShell or CMD on Windows, the `^` character is used for escaping, so you have to double it to avoid this: `git cat-file -p mater^^{tree}`.
+
+If you're using ZSH, the `^` character is used for globbing, so you have to enclose the whole expression in quotes: `git cat-file -p "master^{tree}"`
+====
+
 Conceptually, the data that Git is storing looks something like this:
 
 .Simple version of the Git data model.