diff --git a/docs/reference/gio/meson.build b/docs/reference/gio/meson.build
index 1b5f4468c..b8b93228d 100644
--- a/docs/reference/gio/meson.build
+++ b/docs/reference/gio/meson.build
@@ -59,4 +59,7 @@ custom_target('gio-docs',
   ],
   build_by_default: true,
   depend_files: expand_content_files,
+  install: true,
+  install_dir: docs_dir,
+  install_tag: 'doc',
 )
diff --git a/docs/reference/glib/meson.build b/docs/reference/glib/meson.build
index 028e0e352..a4197a92f 100644
--- a/docs/reference/glib/meson.build
+++ b/docs/reference/glib/meson.build
@@ -23,7 +23,7 @@ if get_option('documentation')
   rst2html5 = find_program('rst2html5', 'rst2html5.py', required: false)
 
   if rst2html5.found()
-    spec_path = glib_datadir / 'doc' / 'glib-2.0'
+    spec_path = docs_dir
 
     figures = files(
       'gvariant-byte-boundaries.svg',
@@ -114,4 +114,7 @@ custom_target('glib-docs',
   ],
   build_by_default: true,
   depend_files: expand_content_files,
+  install: true,
+  install_dir: docs_dir,
+  install_tag: 'doc',
 )
diff --git a/docs/reference/gmodule/meson.build b/docs/reference/gmodule/meson.build
index ac324d672..eb75a0506 100644
--- a/docs/reference/gmodule/meson.build
+++ b/docs/reference/gmodule/meson.build
@@ -20,4 +20,7 @@ custom_target('gmodule-docs',
   ],
   build_by_default: true,
   depend_files: expand_content_files,
+  install: true,
+  install_dir: docs_dir,
+  install_tag: 'doc',
 )
diff --git a/docs/reference/gobject/meson.build b/docs/reference/gobject/meson.build
index ad0d1deaf..03355b7dc 100644
--- a/docs/reference/gobject/meson.build
+++ b/docs/reference/gobject/meson.build
@@ -46,4 +46,7 @@ custom_target('gobject-docs',
   ],
   build_by_default: true,
   depend_files: expand_content_files,
+  install: true,
+  install_dir: docs_dir,
+  install_tag: 'doc',
 )
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index b3fe14d74..b583278f8 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -14,6 +14,8 @@ if get_option('documentation') and enable_gir
     '--fatal-warnings',
   ]
 
+  docs_dir = glib_datadir / 'doc' / 'glib-2.0'
+
   subdir('glib')
   subdir('gmodule')
   subdir('gobject')