diff --git a/doc/build.md b/doc/build.md
index 31be38fd..e1873f93 100644
--- a/doc/build.md
+++ b/doc/build.md
@@ -154,6 +154,10 @@ install it manually and make it available from the `PATH`:
 export PATH="$JAVA_HOME/bin:$PATH"
 ```
 
+When following the rest of the build instructions below, make sure you use the
+MinGW terminal within MSYS2.
+
+
 ### macOS
 
 Install the packages with [Homebrew]: