Update README.md

README.md

@@ -34,7 +34,7 @@ __The Unsecure PWA includes a devcontainer.json to auto-configure all the above
 > [!Tip]
 > ## Teaching advice:
 >
-> This app has been designed as either a teaching tool, an assessment tool or an assessment as a learning tool. __As a teaching tool__ the teacher can use the app to demonstrate discrete vulnerabilities and then teach the preferred patch method. __As an assessment tool__ the students should be taught the knowledge and skills, then given the app to analyse and report on before designing and developing appropriate patches (patching all will be time-prohibitive). __As an assessment as a learning tool__ teachers can teach vulnerabilities in the app and then support students to design and develop patches while assessing them formatively.
+> This app has been designed as either a teaching tool, an assessment tool, an assessment as a learning tool or a professional learning tool. __As a teaching tool__ the teacher can use the app to demonstrate discrete vulnerabilities and then teach the preferred patch method. __As an assessment tool__ the students should be taught the knowledge and skills, then given the app to analyse and report on before designing and developing appropriate patches (patching all will be time-prohibitive). __As an assessment as a learning tool__ teachers can teach vulnerabilities in the app and then support students to design and develop patches while assessing them formatively. __As a professional learning tool__ teachers can use the app to deepen their understanding of vulnerabilities, threat assessment and vulnerability patch design.
 
 ---