diff --git a/src/src/Rendering/Measure/TextAnnotationActor.cpp b/src/src/Rendering/Measure/TextAnnotationActor.cpp
index 1d8283a..ec2cd45 100644
--- a/src/src/Rendering/Measure/TextAnnotationActor.cpp
+++ b/src/src/Rendering/Measure/TextAnnotationActor.cpp
@@ -41,6 +41,7 @@ void TextAnnotationActor::BuildShape() {
 void TextAnnotationActor::SetTextInput(const char *str) {
     strcpy_s(mTextStr, str);
     //BuildShape will be automatically called through render overlay.
+    Modified();
 }