diff --git a/example/web/build-openssl.sh b/example/web/build-openssl.sh
index 5209d0c9..de4f3e3f 100755
--- a/example/web/build-openssl.sh
+++ b/example/web/build-openssl.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-emconfigure || { echo 'emconfigure not found. Install Emscripten and add emconfigure and emmake to PATH environment variable'; exit 1; }
+emconfigure 2> /dev/null || { echo 'emconfigure not found. Install emsdk and add emconfigure and emmake to PATH environment variable. See instruction at https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html. Do not forget to add `emconfigure` and `emmake` to the PATH environment variable via `emsdk/emsdk_env.sh` script.'; exit 1; }
 
 OPENSSL=OpenSSL_1_1_0j
 if [ ! -f $OPENSSL.tar.gz ]; then
diff --git a/example/web/build-tdlib.sh b/example/web/build-tdlib.sh
index 35cacee2..26587bf0 100755
--- a/example/web/build-tdlib.sh
+++ b/example/web/build-tdlib.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-emconfigure || { echo 'emconfigure not found. Install Emscripten and add emconfigure to PATH environment variable'; exit 1; }
+emconfigure 2> /dev/null || { echo 'emconfigure not found. Install emsdk and add emconfigure and emmake to PATH environment variable. See instruction at https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html. Do not forget to add `emconfigure` and `emmake` to the PATH environment variable via `emsdk/emsdk_env.sh` script.'; exit 1; }
 
 rm -rf build/generate
 rm -rf build/asmjs