diff --git a/README.md b/README.md
index ba3ee03..88884ce 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ apt install autoconf autoconf-archive libcmocka0 libcmocka-dev procps iproute2 \
 ```
 
 ### Installing xaptum/ecdaa
-When the TPM should be available for use on this host, set `TEST_USE_TCP_TPM` accordingly
+When the TPM should be available for use on this host, set `ECDAA_TPM_SUPPORT` accordingly
 ```
 # Build the project from source with TPM support
 cmake .. -DCMAKE_BUILD_TYPE=Release -DECDAA_CURVES=FP256BN -DCMAKE_INSTALL_PREFIX=/usr -DECDAA_TPM_SUPPORT=ON