diff --git a/util/build_docs.py b/util/build_docs.py
index bf40267..6c85939 100755
--- a/util/build_docs.py
+++ b/util/build_docs.py
@@ -78,6 +78,7 @@
         "hw/ip/gpio/data/gpio_testplan.hjson",
         "hw/ip/hmac/data/hmac_testplan.hjson",
         "hw/ip/i2c/data/i2c_testplan.hjson",
+        "hw/ip/pinmux/data/pinmux_fpv_testplan.hjson",
         "hw/ip/rv_plic/data/rv_plic_fpv_testplan.hjson",
         "hw/ip/rv_timer/data/rv_timer_testplan.hjson",
         "hw/ip/spi_device/data/spi_device_testplan.hjson",