diff --git a/go.mod b/go.mod
index 2fc50e7..2a3ea91 100644
--- a/go.mod
+++ b/go.mod
@@ -39,7 +39,7 @@ require (
 	github.com/x448/float16 v0.8.4
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d
 	golang.org/x/image v0.0.0-20191214001246-9130b4cfad52
-	golang.org/x/sync v0.4.0
+	golang.org/x/sync v0.5.0
 	modernc.org/sqlite v1.27.0
 	zombiezen.com/go/sqlite v0.13.1
 )
@@ -81,10 +81,10 @@ require (
 	github.com/tdewolff/parse/v2 v2.4.2 // indirect
 	github.com/wcharczuk/go-chart v2.0.2-0.20191206192251-962b9abdec2b+incompatible // indirect
 	go.uber.org/atomic v1.7.0 // indirect
-	golang.org/x/mod v0.13.0 // indirect
-	golang.org/x/sys v0.14.0 // indirect
-	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/tools v0.14.0 // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.16.1 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gonum.org/v1/plot v0.0.0-20190410204940-3a5f52653745 // indirect
 	google.golang.org/protobuf v1.26.0 // indirect
diff --git a/go.sum b/go.sum
index 0e0b68d..d48075d 100644
--- a/go.sum
+++ b/go.sum
@@ -731,8 +731,8 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.13.0 h1:I/DsJXRlw/8l/0c24sM9yb0T4z9liZTduXvdAWYiysY=
-golang.org/x/mod v0.13.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
+golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20180218175443-cbe0f9307d01/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -804,8 +804,8 @@ golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.4.0 h1:zxkM55ReGkDlKSM+Fu41A+zmbZuaPVbGMzvvdUPznYQ=
-golang.org/x/sync v0.4.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
+golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20180224232135-f6cff0780e54/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -875,8 +875,8 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210521090106-6ca3eb03dfc2/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
-golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
+golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -887,8 +887,8 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/time v0.0.0-20170424234030-8be79e1e0910/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -956,8 +956,8 @@ golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
-golang.org/x/tools v0.14.0 h1:jvNa2pY0M4r62jkRQ6RwEZZyPcymeL9XZMLBbV7U2nc=
-golang.org/x/tools v0.14.0/go.mod h1:uYBEerGOWcJyEORxN+Ek8+TT266gXkNlHdJBwexUsBg=
+golang.org/x/tools v0.16.1 h1:TLyB3WofjdOEepBHAU20JdNC1Zbg87elYofWYAY5oZA=
+golang.org/x/tools v0.16.1/go.mod h1:kYVVN6I1mBNoB1OX+noeBjbRk4IUEPa7JJ+TJMEooJ0=
 golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/internal/fs/rewrite/fs.go b/internal/fs/rewrite/fs.go
new file mode 100644
index 0000000..56c7582
--- /dev/null
+++ b/internal/fs/rewrite/fs.go
@@ -0,0 +1,81 @@
+package rewrite
+
+import (
+	"io"
+	"io/fs"
+	"regexp"
+	"strings"
+	"testing/fstest"
+	"time"
+)
+
+type FileSystem struct {
+	FS        fs.FS
+	rewritten fstest.MapFS
+}
+
+func FS(fs fs.FS, exts []string, regex string, replace string) (*FileSystem, error) {
+	rfs := &FileSystem{
+		FS:        fs,
+		rewritten: make(fstest.MapFS),
+	}
+	var err error
+	re, err := regexp.Compile(regex)
+	if err != nil {
+		return nil, err
+	}
+	err = rfs.replace(exts, re, replace)
+	if err != nil {
+		return nil, err
+	}
+	return rfs, nil
+}
+
+func (rfs *FileSystem) Open(name string) (fs.File, error) {
+	if f, err := rfs.rewritten.Open(name); err == nil {
+		return f, nil
+	}
+	return rfs.FS.Open(name)
+}
+
+func (rfs *FileSystem) replace(exts []string, re *regexp.Regexp, repl string) error {
+	fs.WalkDir(rfs.FS, ".", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
+
+		if !strings.HasSuffix(path, ".html") &&
+			!strings.HasSuffix(path, ".css") &&
+			!strings.HasSuffix(path, ".js") {
+			return nil
+		}
+
+		f, err := rfs.FS.Open(path)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+
+		data, err := io.ReadAll(f)
+		if err != nil {
+			return err
+		}
+
+		str := string(data)
+
+		r := re.ReplaceAllString(str, repl)
+		contains := str != r
+		if contains {
+			rfs.rewritten[path] = &fstest.MapFile{
+				Data:    []byte(r),
+				Mode:    0644,
+				ModTime: time.Now(),
+			}
+		}
+		return nil
+	})
+	return nil
+}
diff --git a/main.go b/main.go
index 5736512..fb6919e 100644
--- a/main.go
+++ b/main.go
@@ -54,6 +54,7 @@ import (
 
 	"photofield/internal/codec"
 	"photofield/internal/collection"
+	"photofield/internal/fs/rewrite"
 	"photofield/internal/geo"
 	"photofield/internal/image"
 	"photofield/internal/layout"
@@ -647,17 +648,17 @@ func (*Api) PostTasks(w http.ResponseWriter, r *http.Request) {
 }
 
 func (*Api) GetCapabilities(w http.ResponseWriter, r *http.Request) {
-	docsUrl := os.Getenv("PHOTOFIELD_DOCS_URL")
-	if docsUrl == "" {
-		docsUrl = "/docs/usage"
+	docsurl := os.Getenv("PHOTOFIELD_DOCS_URL")
+	if docsurl == "" {
+		docsurl = "/docs/usage"
 	}
 	capabilities := openapi.Capabilities{}
 	if imageSource != nil {
 		capabilities.Search.Supported = imageSource.AI.Available()
 	}
 	capabilities.Tags.Supported = tagsEnabled
-	capabilities.Docs.Supported = docsUrl != ""
-	capabilities.Docs.Url = docsUrl
+	capabilities.Docs.Supported = docsurl != ""
+	capabilities.Docs.Url = docsurl
 	respond(w, r, http.StatusOK, capabilities)
 }
 
@@ -1483,6 +1484,24 @@ func main() {
 				if err != nil {
 					panic(err)
 				}
+				docspath := os.Getenv("PHOTOFIELD_DOCS_PATH")
+				if docspath != "" {
+					// rewriteDocs(docfs, docsurl)
+					var err error
+					docfs, err = rewrite.FS(
+						docfs,
+						[]string{
+							"html",
+							"css",
+							"js",
+						},
+						`("|url\()(/docs/)`,
+						`${1}`+docspath,
+					)
+					if err != nil {
+						panic(err)
+					}
+				}
 				dochandler := gzipped.FileServer(http.FS(docfs))
 				r.HandleFunc("/docs/*", func(w http.ResponseWriter, r *http.Request) {
 					if ext := path.Ext(r.URL.Path); ext == "" {