diff --git a/Evergreen.xcodeproj/project.pbxproj b/Evergreen.xcodeproj/project.pbxproj
index 2a6356a1b..40916bb78 100644
--- a/Evergreen.xcodeproj/project.pbxproj
+++ b/Evergreen.xcodeproj/project.pbxproj
@@ -497,6 +497,7 @@
 		84B99C6A1FAE370B00ECDEDB /* FeedListFeed.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeedListFeed.swift; sourceTree = "<group>"; };
 		84B99C9C1FAE83C600ECDEDB /* DeleteFromSidebarCommand.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeleteFromSidebarCommand.swift; sourceTree = "<group>"; };
 		84BB4B611F1174D400858766 /* Data.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = Data.xcodeproj; path = Frameworks/Data/Data.xcodeproj; sourceTree = "<group>"; };
+		84CBDDAE1FD3674C005A61AA /* Technotes */ = {isa = PBXFileReference; lastKnownFileType = folder; path = Technotes; sourceTree = "<group>"; };
 		84DAEE2F1F86CAFE0058304B /* OPMLImporter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OPMLImporter.swift; sourceTree = "<group>"; };
 		84DAEE311F870B390058304B /* DockBadge.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = DockBadge.swift; path = Evergreen/DockBadge.swift; sourceTree = "<group>"; };
 		84E46C7C1F75EF7B005ECFB3 /* AppDefaults.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = AppDefaults.swift; path = Evergreen/AppDefaults.swift; sourceTree = "<group>"; };
@@ -803,6 +804,7 @@
 			isa = PBXGroup;
 			children = (
 				845B14A51FC2299E0013CF92 /* README.md */,
+				84CBDDAE1FD3674C005A61AA /* Technotes */,
 				842E45E61ED8C747000A8B52 /* DB5.plist */,
 				849C64671ED37A5D003D8FC0 /* Assets.xcassets */,
 				849C64691ED37A5D003D8FC0 /* Main.storyboard */,
diff --git a/Technotes/HiddenPrefs.md b/Technotes/HiddenPrefs.md
new file mode 100644
index 000000000..15e6fd3f1
--- /dev/null
+++ b/Technotes/HiddenPrefs.md
@@ -0,0 +1,5 @@
+# Hidden Preferences
+
+See AppDefaults.swift for the app’s preference keys, including hidden prefs.
+
+(TODO: document them here.)
\ No newline at end of file
diff --git a/Technotes/README.md b/Technotes/README.md
new file mode 100644
index 000000000..d5b76a7d2
--- /dev/null
+++ b/Technotes/README.md
@@ -0,0 +1,3 @@
+# TechNotes
+
+[Hidden Preferences](hiddenPrefs.md)