diff --git a/lib/schema.js b/lib/schema.js
index 2294646..ac89ba9 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -33,6 +33,8 @@ var tags = [
   { short: 'If', full: 'Fn::If', type: 'sequence' },
   { short: 'Not', full: 'Fn::Not', type: 'sequence' },
   { short: 'Or', full: 'Fn::Or', type: 'sequence' },
+  { short: 'GetCidr', full: 'Fn::GetCidr', type: 'sequence' },
+  { short: 'GetCidr', full: 'Fn::GetCidr', type: 'mapping' },
 
 ].map(function(fn) {
   return new yaml.Type('!' + fn.short, {