diff --git a/qiskit/circuit/library/graph_state.py b/qiskit/circuit/library/graph_state.py
index 79c0dfbc864..5a7226c3176 100644
--- a/qiskit/circuit/library/graph_state.py
+++ b/qiskit/circuit/library/graph_state.py
@@ -41,6 +41,7 @@ class GraphState(QuantumCircuit):
     **Reference Circuit:**
 
     .. plot::
+       :alt: [Circuit diagram output by the previous code.]
 
        from qiskit.circuit.library import GraphState
        from qiskit.visualization.library import _generate_circuit_library_visualization
@@ -105,6 +106,7 @@ class GraphStateGate(Gate):
     **Reference Circuit:**
 
     .. plot::
+        :alt: [Circuit diagram output by the previous code.]
         :include-source:
 
         from qiskit.circuit import QuantumCircuit