Readme update

Author: xordiv

README.md

@@ -3,6 +3,8 @@ Docker image built from official PHP image with v8js, blitz, composer, nodejs, n
 
 Image is specific and in development, but Dockerfile may be helpful for build v8, v8js, blitz and other.
 
+Full build time is about 45 minutes because Debian has no actual version of v8 library (libv8) and building from source takes time.
+
 ### Description:
 
 **Extensions:** v8js, blitz, libsodium, xdiff, xdebug, gd,
@@ -45,4 +47,4 @@ Disable it for production or redirect logs to *stdout&stderr*.
     /docker-entry.sh - Entrypoint for conteiner
     /docker-cmd.sh - Default command for conteiner which starts php-fpm
     /php-reload.sh - Reload php-fpm config by sending to it signal USR2
-    /app-build.sh - The script just exec script localed in /app/scripts/build.sh
+    /app-build.sh - The script just exec script localed in /app/scripts/build.sh