diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index ec084d1..69092d0 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -14,6 +14,8 @@ concurrency:
   group: "pages"
   cancel-in-progress: false
 
+env:
+  LANG: "en_US.UTF-8"
 jobs:
   docs-deploy:
     runs-on: ubuntu-latest
@@ -25,12 +27,18 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install build-essential naturaldocs
+          sudo apt-get install build-essential wget unzip
+          sudo locale-gen en_US.UTF-8
+          sudo update-locale LANG=en_US.UTF-8
+          wget https://sourceforge.net/projects/naturaldocs/files/Stable%20Releases/1.52/NaturalDocs-1.52.zip/download -O /tmp/NaturalDocs-1.52.zip
+          (cd /tmp; unzip NaturalDocs-1.52.zip; mv NaturalDocs naturaldocs; chmod +x naturaldocs)
+
       - name: generate-docs
         run: |
+          export PATH="$PATH:/tmp"
           make docs
       - name: setup-pages
-        uses: actions/configure-pages@v4
+        uses: actions/configure-pages@v5
       - name: upload-artifact
         uses: actions/upload-pages-artifact@v3
         with:
diff --git a/include/Makefile b/include/Makefile
index ea1dec0..fa78381 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -9,7 +9,7 @@ all:
 clean:
 
 .PHONY: install
-install: $(INCS) $(INCSYSDIR)
+install: $(INCS) $(SYSINCS)
 	@ mkdir -p $(DESTDIR)$(INCDIR)
 	install $(INCS) $(DESTDIR)$(INCDIR)
 	@ mkdir -p $(DESTDIR)$(INCSYSDIR)
diff --git a/kernel/fs/stpdfs.inc b/kernel/fs/stpdfs.inc
index 805c410..d714286 100644
--- a/kernel/fs/stpdfs.inc
+++ b/kernel/fs/stpdfs.inc
@@ -93,6 +93,34 @@ DEFN StpdFS_Sb
 	;; .zone    - TODO
 	;; .actime  - TODO
 	;; .modtime - TODO
+	;;
+	;;
+	;; Zone 0-6 are direct, zone 7 indirect, zone 8 double indirect, zone 9 triple indirect
+	;; >                         ┌────────┐                                                
+	;; >                         │        │                                                
+	;; >                ┌───────►│Data    │                                                
+	;; >                │        │        │                                                
+	;; > ┌──────┐ Direct│        └────────┘                                                
+	;; > │zone 0├───────┘                                                                  
+	;; > ├──────┤                                                                          
+	;; > │...   │                                                                          
+	;; > ├──────┤          ┌────────┐      ┌────────┐                                      
+	;; > │zone 6│          │        ├─────►│        │                                      
+	;; > ├──────┤ Indirect │        │      │ Data   │                                      
+	;; > │zone 7├─────────►│        │      │        │                                      
+	;; > ├──────┤          └────────┘      └────────┘                                      
+	;; > │zone 8├───────┐                                                                  
+	;; > ├──────┤       │Double indirect┌─────────┐    ┌────────┐    ┌─────────┐           
+	;; > │zone 9│       └──────────────►│         ├───►│        ├───►│         │           
+	;; > └──┬───┘                       │         │    │        │    │ Data    │           
+	;; >    │                           │         │    │        │    │         │           
+	;; >    │                           └─────────┘    └────────┘    └─────────┘           
+	;; >    │ Triple indirect ┌────────┐                                                   
+	;; >    └────────────────►│        │    ┌──────────┐      ┌─────────┐      ┌──────────┐
+	;; >                      │        ├───►│          │      │         │      │          │
+	;; >                      │        │    │          ├─────►│         ├─────►│ Data     │
+	;; >                      └────────┘    │          │      │         │      │          │
+	;; >                                    └──────────┘      └─────────┘      └──────────┘
 struc StpdFS_Inode {
 	.mode    dw ?
 	.nlink   dw ?
@@ -117,6 +145,8 @@ struc StpdFS_Dirent {
 }
 DEFN StpdFS_Dirent
 
+STPDFS_DIRENT_PER_BLOCK = sizeof.StpdFS_Dirent / STPDFS_BSIZE
+
 	; ------------------------------------------------------------------------
 
 	;; Section: Implementation