diff --git a/examples.md b/examples.md
index bef0797..af5fc35 100644
--- a/examples.md
+++ b/examples.md
@@ -118,3 +118,5 @@ uses: actions/cache@preview
     path: ~/.cabal/store
     key: ${{ runner.os }}-haskell-${{ matrix.ghc }}
 ```
+
+Note: `matrix.ghc` denotes the Haskell compiler version (see also https://github.com/actions/setup-haskell)