diff --git a/doc/build.gradle b/doc/build.gradle
index 9024f18a20..0c66c8ae39 100644
--- a/doc/build.gradle
+++ b/doc/build.gradle
@@ -32,6 +32,7 @@ task a2x(dependsOn: copySources) {
 }
 
 task createPdf(type: DocbookPdf) {
+    group = 'Toolchain'
     setDescription('Generates PDF docbook output.')
     extension = 'fo'
     dependsOn a2x
@@ -42,6 +43,7 @@ task createPdf(type: DocbookPdf) {
 }
 
 task createHtml(type: DocbookHtml) {
+    group = 'Toolchain'
     setDescription('Generates HTML docbook output.')
     dependsOn a2x,copyWebResources
     sourceFileName "book.xml"
@@ -50,14 +52,14 @@ task createHtml(type: DocbookHtml) {
     stylesheet "${projectDir}/src/xslt/html.xsl" as File
 }
 
-task viewHtml (dependsOn: createHtml, description: 'Open HTML docbook outout in default browser') {
+task viewHtml (dependsOn: createHtml, description: 'Open HTML docbook outout in default browser', group: 'Toolchain') {
   doLast {
     Class.forName("java.awt.Desktop").newInstance().browse(
         new File("${buildDir}/docbook/html", 'book.html').toURI())
   }
 }
 
-task viewPdf (dependsOn: createPdf , description: 'Open PDF docbook outout in default viewer') {
+task viewPdf (dependsOn: createPdf , description: 'Open PDF docbook outout in default viewer', group: 'Toolchain') {
   doLast {
     Class.forName("java.awt.Desktop").newInstance().browse(
         new File("${buildDir}/docbook/pdf", this.project.rootProject.name + '.pdf').toURI())