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authoravborhanian <dobbybabee@gmail.com>2018-02-04 13:46:29 -0500
committerWho? Me?! <mark-i-m@users.noreply.github.com>2018-02-04 13:13:17 -0600
commit90cf3918cfe4692cefdaef7e1f0c268d497cf97f (patch)
tree692e8a1018086d7f3ac58a34fef727b4677e5a0e /src/doc/rustc-dev-guide
parentf2a5c4b57b0d1f985737f23fb2a3d819df030df1 (diff)
downloadrust-90cf3918cfe4692cefdaef7e1f0c268d497cf97f.tar.gz
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Update glossary.md
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diff --git a/src/doc/rustc-dev-guide/src/glossary.md b/src/doc/rustc-dev-guide/src/glossary.md
index 186e1a4c793..ee27362af3f 100644
--- a/src/doc/rustc-dev-guide/src/glossary.md
+++ b/src/doc/rustc-dev-guide/src/glossary.md
@@ -14,7 +14,7 @@ HirId                   |  identifies a particular node in the HIR by combining
 'gcx                    |  the lifetime of the global arena ([see more](ty.html))
 generics                |  the set of generic type parameters defined on a type or item
 ICE                     |  internal compiler error. When the compiler crashes.
-ICH                     |  incremental compilation hash.
+ICH                     |  incremental compilation hash. ICHs are used as fingerprints for things such as HIR and crate metadata, to check if changes have been made.
 infcx                   |  the inference context (see `librustc/infer`)
 MIR                     |  the Mid-level IR that is created after type-checking for use by borrowck and trans ([see more](./mir.html))
 obligation              |  something that must be proven by the trait system ([see more](trait-resolution.html))