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diff --git a/HOWTO.md b/HOWTO.md
index 6a4d723..d948e59 100644
--- a/HOWTO.md
+++ b/HOWTO.md
@@ -30,6 +30,7 @@ To build and run the tests, you need to enable the `DEMO_BUILD_TESTS` option in
 Available test suites:
 *   `HammingWindowTest`: Verifies the properties of the Hamming window function.
 *   `SynthEngineTest`: Verifies the core functionality of the audio synthesizer.
+*   `SpectoolEndToEndTest`: Performs an end-to-end test of the `spectool` by generating a WAV file, analyzing it, and verifying the output.
 
 ```bash
 cmake -S . -B build -DDEMO_BUILD_TESTS=ON