diff --git a/src/main/java/de/neemann/digital/gui/GuiModelObserver.java b/src/main/java/de/neemann/digital/gui/GuiModelObserver.java
index 8cddfd117..9723ed7cd 100644
--- a/src/main/java/de/neemann/digital/gui/GuiModelObserver.java
+++ b/src/main/java/de/neemann/digital/gui/GuiModelObserver.java
@@ -7,7 +7,7 @@ import de.neemann.digital.gui.components.CircuitComponent;
 
 /**
  * This observer is added to the model if real time timers are started.
- * Its paints the CircuitComponent after a step is calculated.
+ * This observer paints the CircuitComponent after a step is calculated.
  * It is registered to all elements which visual representation depends on a model value.
  * This listener method only sets a flag if there was a change.
  * For repainting it is also registered to the model to repaint the circuit if the step is complete.