diff --git a/.bash_aliases b/.bash_aliases
index ab245ad..74b55f9 100755
--- a/.bash_aliases
+++ b/.bash_aliases
@@ -180,6 +180,10 @@ function cntdn() {
 }
 
 function ramdisk() {
+    if [ -z "$1" ]; then
+        echo "Error: Ramdisk size not specified."
+        return 1
+    fi
     if [ ! -d "$HOME/ramdown" ]; then
         mkdir "$HOME/ramdown"
     fi