diff --git a/cli-options.go b/cli-options.go
index 2ed4563..11b818a 100644
--- a/cli-options.go
+++ b/cli-options.go
@@ -1,4 +1,4 @@
-// Copyright (c) 2024 David Vogel
+// Copyright (c) 2024-2025 David Vogel
 //
 // This software is released under the MIT License.
 // https://opensource.org/licenses/MIT
@@ -22,6 +22,14 @@ const (
 	OutputFormatHTML OutputFormat = "html" // this format is only available since 0.13.0
 )
 
+type PDFStandard string
+
+const (
+	PDFStandard1_7  PDFStandard = "1.7"  // PDF 1.7
+	PDFStandardA_2B PDFStandard = "a-2b" // PDF/A-2b
+	PDFStandardA_3B PDFStandard = "a-3b" // PDF/A-3b (Available since Typst 0.13.0 and later)
+)
+
 type CLIOptions struct {
 	Root              string            // Configures the project root (for absolute paths).
 	Input             map[string]string // String key-value pairs visible through `sys.inputs`.
@@ -42,13 +50,10 @@ type CLIOptions struct {
 	Format OutputFormat // The format of the output file, inferred from the extension by default.
 	PPI    int          // The PPI (pixels per inch) to use for PNG export. Defaults to 144.
 
-	// One (or multiple comma-separated) PDF standards that Typst will enforce conformance with.
+	// One (or multiple) PDF standards that Typst will enforce conformance with.
 	//
-	// Possible values:
-	//
-	//	- 1.7: PDF 1.7
-	//	- a-2b: PDF/A-2b
-	PDFStandard string
+	// See typst.PDFStandard for possible values.
+	PDFStandards []PDFStandard
 
 	Custom []string // Custom command line options go here.
 }
@@ -112,8 +117,15 @@ func (c *CLIOptions) Args() (result []string) {
 		result = append(result, "--ppi", strconv.FormatInt(int64(c.PPI), 10))
 	}
 
-	if c.PDFStandard != "" {
-		result = append(result, "--pdf-standard", c.PDFStandard)
+	if len(c.PDFStandards) > 0 {
+		var standards string
+		for i, standard := range c.PDFStandards {
+			if i > 0 {
+				standards += ","
+			}
+			standards += string(standard)
+		}
+		result = append(result, "--pdf-standard", standards)
 	}
 
 	result = append(result, c.Custom...)