diff --git a/README.md b/README.md
index 95a5f908f..e18559037 100644
--- a/README.md
+++ b/README.md
@@ -87,18 +87,16 @@ Consider using a Linux VM or dual booting.**
 
 0. Checkout all submodules
 ```
-git submodule init
-git submodule update
+git submodule update --init --recursive
 ```
 
 1. Install Android SDK and NDK (default location is $HOME/Android/SDK, otherwise you need to specify $ANDROID_HOME for it)
 
 It is recommended to use [AndroidStudio](https://developer.android.com/studio) to install.
 
-2. Install golang ( 1.16 ).
+2. Install golang and yasm
 ```shell
-# debian sid
-apt install -y golang-1.16
+apt install -y golang-1.16 yasm
 ```
 
 3. Install Rust and its stdlib for Android ABIs, and add environment variables for it.
@@ -115,10 +113,7 @@ rustup target install armv7-linux-androideabi aarch64-linux-android i686-linux-a
 ```
 
 4. Build native dependencies: `./run init libs`
-5. Build external libraries and native code:
-
-`./run libs update`
-
+5. Build external libraries and native code: `./run libs update`
 6. Fill out `TELEGRAM_APP_ID` and `TELEGRAM_APP_HASH` in `local.properties`
 7. Replace TMessagesProj/google-services.json if you want fcm to work.
 8. Replace release.keystore with yours and fill out `ALIAS_NAME`, `KEYSTORE_PASS` and `ALIAS_PASS` in `local.properties` if you want a custom sign key.
diff --git a/bin/init/libs/libvpx.sh b/bin/init/libs/libvpx.sh
index 4bb1b3879..9023f0b5b 100755
--- a/bin/init/libs/libvpx.sh
+++ b/bin/init/libs/libvpx.sh
@@ -2,6 +2,8 @@
 
 source "bin/init/env.sh"
 
+yasm --version || exit 1
+
 cd TMessagesProj/jni || exit 1
 git submodule update --init libvpx