diff --git a/.github/workflows/linux-nightly.yml b/.github/workflows/linux-nightly.yml
index 3941b772f..6fec8db0a 100644
--- a/.github/workflows/linux-nightly.yml
+++ b/.github/workflows/linux-nightly.yml
@@ -93,6 +93,7 @@ jobs:
       uses: actions/checkout@v2
 
     # declare/restore cached things
+    # caching doesn't work for nightly runs yet https://github.com/actions/cache/issues/63
 
     - name: Cache stack global package db
       id:   stack-global
diff --git a/.github/workflows/mac-nightly.yml b/.github/workflows/mac-nightly.yml
index eb56f8e7a..e595b0ae5 100644
--- a/.github/workflows/mac-nightly.yml
+++ b/.github/workflows/mac-nightly.yml
@@ -32,6 +32,7 @@ jobs:
       uses: actions/checkout@v2
 
     # declare/restore cached things
+    # caching doesn't work for nightly runs yet https://github.com/actions/cache/issues/63
 
     - name: Cache stack global package db
       id:   stack-global
diff --git a/.github/workflows/windows-nightly.yml b/.github/workflows/windows-nightly.yml
index b121b295a..a7d3a37c2 100644
--- a/.github/workflows/windows-nightly.yml
+++ b/.github/workflows/windows-nightly.yml
@@ -34,6 +34,7 @@ jobs:
       uses: actions/checkout@v2
 
     # declare/restore cached things
+    # caching doesn't work for nightly runs yet https://github.com/actions/cache/issues/63
 
     - name: Cache stack global package db
       id:   stack-global-package-db