diff --git a/docs/Building_Diagrams/images/collaboration_correlation.PNG b/docs/Building_Diagrams/images/collaboration_correlation.png similarity index 100% rename from docs/Building_Diagrams/images/collaboration_correlation.PNG rename to docs/Building_Diagrams/images/collaboration_correlation.png diff --git a/docs/Building_Diagrams/images/configure_conditional_event.PNG b/docs/Building_Diagrams/images/configure_conditional_event.png similarity index 100% rename from docs/Building_Diagrams/images/configure_conditional_event.PNG rename to docs/Building_Diagrams/images/configure_conditional_event.png diff --git a/docs/Building_Diagrams/images/pool_configuration.PNG b/docs/Building_Diagrams/images/pool_configuration.png similarity index 100% rename from docs/Building_Diagrams/images/pool_configuration.PNG rename to docs/Building_Diagrams/images/pool_configuration.png diff --git a/docs/Building_Diagrams/images/timer_field.PNG b/docs/Building_Diagrams/images/timer_field.png similarity index 100% rename from docs/Building_Diagrams/images/timer_field.PNG rename to docs/Building_Diagrams/images/timer_field.png