diff --git a/rc/bashrc b/rc/bashrc
index 87adba1c..29e9e872 100755
--- a/rc/bashrc
+++ b/rc/bashrc
@@ -923,6 +923,12 @@ else
 	}
 fi
 
+# In Debian there is "sudo adduser whoever whatever", but I keep forgetting
+# that the more common way is usermod -aG whatever,whereever whoever
+adduser-to-group() {
+	usermod -aG "$2" "$1"
+}
+
 # Source files for miscannellious modifications.
 
 # acme.sh
diff --git a/rc/zshrc b/rc/zshrc
index 501d15f4..5a9a55ec 100755
--- a/rc/zshrc
+++ b/rc/zshrc
@@ -901,6 +901,12 @@ else
 	}
 fi
 
+# In Debian there is "sudo adduser whoever whatever", but I keep forgetting
+# that the more common way is usermod -aG whatever,whereever whoever
+adduser-to-group() {
+	usermod -aG "$2" "$1"
+}
+
 # Source files for miscannellious modifications.
 
 # acme.sh