diff --git a/src/utilities/buildClientSchema.js b/src/utilities/buildClientSchema.js
index 531036dca3..ecea2bfe1a 100644
--- a/src/utilities/buildClientSchema.js
+++ b/src/utilities/buildClientSchema.js
@@ -143,7 +143,7 @@ export function buildClientSchema(
     const type = getType(typeRef);
     invariant(
       isInputType(type),
-      'Introspection must provide input type for arguments.',
+      'Introspection must provide input type for arguments, but received: ' + inspect(type),
     );
     return type;
   }
@@ -154,7 +154,7 @@ export function buildClientSchema(
     const type = getType(typeRef);
     invariant(
       isOutputType(type),
-      'Introspection must provide output type for fields.',
+      'Introspection must provide output type for fields, but received: ' + inspect(type),
     );
     return type;
   }