diff --git a/BUILDING.md b/BUILDING.md
index 3435157..cf97a5f 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -62,4 +62,6 @@ Install the following:
 * [Visual Studio Build Tools](https://visualstudio.microsoft.com/downloads/) (for a C++ compiler)
 * CMake (can be installed with the Visual Studio Build Tools)
 
+Make sure your Qt bin (like `C:\Qt\6.7.0\msvc2019_64\bin`) is in your `PATH` environment variable before building, otherwise Qt will not be picked up by CMake.
+
 Afterwards, run `.\scripts\windows-setup.ps1` and `.\scripts\windows-build.ps1` in PowerShell.