diff --git a/website/pages/partials/from-1.5/variables/custom-validation.mdx b/website/pages/partials/from-1.5/variables/custom-validation.mdx
index 0da062710..42af7e1d7 100644
--- a/website/pages/partials/from-1.5/variables/custom-validation.mdx
+++ b/website/pages/partials/from-1.5/variables/custom-validation.mdx
@@ -22,7 +22,7 @@ The expression can refer only to the variable that the condition applies to,
 and _must not_ produce errors.
 
 If the failure of an expression is the basis of the validation decision, use
-[the `can` function](./functions/can.html) to detect such errors. For example:
+[the `can` function](/docs/from-1.5/functions/conversion/can) to detect such errors. For example:
 
 ```hcl
 variable "image_id" {
@@ -59,6 +59,11 @@ variable "image_metadata" {
     error_message = "The image_metadata.key field must be more than 4 runes."
   }
 
+  validation {
+    condition     = can(var.image_metadata.something.foo)
+    error_message = "The image_metadata.something.foo field must exist."
+  }
+
   validation {
     condition     = substr(var.image_metadata.something.foo, 0, 3) == "bar"
     error_message = "The image_metadata.something.foo field must start with \"bar\"."