diff --git a/pages.nl/common/visudo.md b/pages.nl/common/visudo.md
index 2aa4805a6a..4b5b24daa8 100644
--- a/pages.nl/common/visudo.md
+++ b/pages.nl/common/visudo.md
@@ -1,7 +1,7 @@
 # visudo
 
 > Bewerk veilig het sudoers-bestand.
-> Meer informatie: <https://www.sudo.ws/man/1.8.13/visudo.man.html>.
+> Meer informatie: <https://www.sudo.ws/docs/man/visudo.man>.
 
 - Bewerk sudoers-bestand:
 
diff --git a/pages.sv/common/visudo.md b/pages.sv/common/visudo.md
index 1582042ce0..1cfd3da490 100644
--- a/pages.sv/common/visudo.md
+++ b/pages.sv/common/visudo.md
@@ -1,7 +1,7 @@
 # visudo
 
 > Redigera sudoers-filen på säkert sätt.
-> Mer information: <https://www.sudo.ws/man/1.8.13/visudo.man.html>.
+> Mer information: <https://www.sudo.ws/docs/man/visudo.man>.
 
 - Redigera sudoers-filen:
 
diff --git a/pages/common/singularity.md b/pages/common/singularity.md
index a6c1a0e499..46e660aa79 100644
--- a/pages/common/singularity.md
+++ b/pages/common/singularity.md
@@ -1,6 +1,7 @@
 # singularity
 
 > Manage Singularity containers and images.
+> More information: <https://singularity-docs.readthedocs.io/en/latest/#commands>.
 
 - Download a remote image from Sylabs Cloud:
 
diff --git a/pages/common/spatial.md b/pages/common/spatial.md
index f6b525b9eb..9d3bb76864 100644
--- a/pages/common/spatial.md
+++ b/pages/common/spatial.md
@@ -1,6 +1,7 @@
 # spatial
 
 > A set of commands for managing and developing SpatialOS projects.
+> More information: <https://ims.improbable.io/products/spatialos>.
 
 - Run this when you use a project for the first time:
 
diff --git a/pages/common/virt-sparsify.md b/pages/common/virt-sparsify.md
index a4d08a3947..b9627e0b2d 100644
--- a/pages/common/virt-sparsify.md
+++ b/pages/common/virt-sparsify.md
@@ -2,7 +2,7 @@
 
 > Make virtual machine drive images thin-provisioned.
 > NOTE: Use only for offline machines to avoid data corruption.
-> Home page: <https://libguestfs.org/>.
+> More information: <https://libguestfs.org>.
 
 - Create a sparsified compressed image without snapshots from an unsparsified one:
 
diff --git a/pages/common/visudo.md b/pages/common/visudo.md
index d7b205af96..ad1395dc77 100644
--- a/pages/common/visudo.md
+++ b/pages/common/visudo.md
@@ -1,7 +1,7 @@
 # visudo
 
 > Safely edit the sudoers file.
-> More information: <https://www.sudo.ws/man/1.8.13/visudo.man.html>.
+> More information: <https://www.sudo.ws/docs/man/visudo.man>.
 
 - Edit the sudoers file:
 
diff --git a/pages/common/waitress-serve.md b/pages/common/waitress-serve.md
index ac48c60df3..833da7351f 100644
--- a/pages/common/waitress-serve.md
+++ b/pages/common/waitress-serve.md
@@ -1,7 +1,7 @@
 # waitress-serve
 
 > Pure Python WSGI HTTP Server.
-> More information: <https://github.com/Pylons/waitress>.
+> More information: <https://docs.pylonsproject.org/projects/waitress/en/latest/runner.html>.
 
 - Run a Python web app: