diff --git a/INSTALL.txt b/INSTALL.txt
index 1aab56aa..c5f26f75 100644
--- a/INSTALL.txt
+++ b/INSTALL.txt
@@ -94,7 +94,7 @@ From your CMake project, add
 
 or for Qt6
 
-    find_package(KDSoap-qt6 CONFIG)
+    find_package(KDSoap-qt6 CONFIG REQUIRED)
 
 and link to the imported target KDSoap::kdsoap.
 That's all you need to do (the imported target also brings in the include directories)