diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 69500255026c7c5577f3e6275dd36e241c62f26d..2518272f9b073647e054029c977633495d83f310 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -856,7 +856,7 @@ def traverse_with_deptype(self, visited=None, d=0, deptype=None,
                        children in the dependency DAG.
 
            cover    [=nodes|edges|paths]
-               Determines how extensively to cover the dag.  Possible vlaues:
+               Determines how extensively to cover the dag.  Possible values:
 
                'nodes': Visit each node in the dag only once.  Every node
                         yielded by this function will be unique.