diff --git a/tools/install-docs-deps b/tools/install-docs-deps
index 100a7ba924..fef0c52206 100755
--- a/tools/install-docs-deps
+++ b/tools/install-docs-deps
@@ -10,10 +10,10 @@ set -ex
 
 # Install packages to run build.rs in some crate:
 # * libcap-dev: Used by minijail-sys/build.rs
+# * libudev-dev: Used by libudev-sys's build.rs, pulled by libva
 # * protobuf-compiler: Generates Rust files in protos
 sudo apt install --yes --no-install-recommends \
      libcap-dev \
-     # libudev-dev is required to build the libva documentation.
      libudev-dev \
      protobuf-compiler