pGCL is both a programming language and a specification language that incorporates both probabilistic and nondeterministic choice, in a unified manner. Program verification is by refinement or annotation (or both), using either Hoare triples, or weakest-precondition entailment, in the style of GCL. This package provides both a shallow embedding of the language primitives, and an annotation and refinement framework. The generated document includes a brief tutorial.