1 files changed, 4 insertions, 0 deletions
diff --git a/lib/spack/spack/schema/config.py b/lib/spack/spack/schema/config.py
index 99eecd67e6..06dadc802c 100644
--- a/lib/spack/spack/schema/config.py
+++ b/lib/spack/spack/schema/config.py
@@ -103,6 +103,10 @@ properties = {
                 'type': 'string',
                 'enum': ['urllib', 'curl']
             },
+            'additional_external_search_paths': {
+                'type': 'array',
+                'items': {'type': 'string'}
+            }
         },
     },
 }