diff --git a/docs/building.md b/docs/building.md
index 72a052a63..614282512 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -53,11 +53,12 @@ sudo apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386 lib32z1 libbz2-
 ### Build dependencies
 Install basic dependencies
 ```
-sudo apt-get install libssl-dev curl unzip automake build-essential file pkg-config git python3 libtool libtinfo6 cmake libgit2-dev clang libncurses5-dev libncursesw5-dev zlib1g-dev llvm g++ gcc gperf libopencv-dev python3-typogrify xsltproc valac gobject-introspection vapigen meson
+sudo apt-get install libssl-dev curl unzip automake build-essential file pkg-config git python3 libtool libtinfo6 cmake libgit2-dev clang libncurses5-dev libncursesw5-dev zlib1g-dev llvm g++ gcc gperf libopencv-dev python3-typogrify xsltproc valac gobject-introspection meson
 ```
 
 For Ubuntu 20.04,
 ```
+sudo apt-get install vapigen
 pip3 install --upgrade meson==0.64.1 markdown==3.4.1 markupsafe==2.1.1 jinja2==3.1.2 pygments==2.13.0 toml==0.10.2 typogrify==2.0.7 tomli==2.0.1
 ```