diff --git a/environments/dotnet/README.md b/environments/dotnet/README.md
index 3e9829d6..e122e925 100644
--- a/environments/dotnet/README.md
+++ b/environments/dotnet/README.md
@@ -35,54 +35,17 @@ Please see examples below.
 
 ## Rebuilding and pushing the image
 
-To rebuild the image you need either a computer with dotnet 1.1.0
-installed or else you will have to map the source directory into a
-container containing the dotnet 1.1.0 environment.
+To rebuild the image you will have to install Docker with version higher than 17.05+
+in order to support multi-stage builds feature.  
 
-### Locally installed Dotnet 1.1.0
+### Rebuild containers
 
-Simply move to the source directory in a terminal and run the ./build.sh script.
-
-The script will restore dependencies, compile a release build and
-and build the container. If you need to change the name of the container
-simply change it in the script.
-
-After the build finishes push the new image to a Docker registry using the 
-standard procedure.
-
-### Build in a container
-
-Move to the directory containing the source and start the Docker container
-with dotnet and mount the current directory to a build location:
+Move to the directory containing the source and start the container build process:
 
 ```
-docker run -it --rm -v $PWD:/build microsoft/dotnet
-```
-
-Move to the build directory inside the container and restore the packages:
-
-```
-cd /build 
-dotnet restore
-log  : Restoring packages for /source/project.json...
-log  : Installing System.Net.WebSockets 4.0.0.
-log  : Installing runtime.native.System.IO.Compression 4.1.0.
-...
-```
-
-Compile and publish a release build of the source to the 'out' folder:
-
-```
-dotnet publish -c Release -o out
-Publishing source for .NETCoreApp,Version
-...
-```
-Exit the build container and build the Docker container on the local host:
-
-```
-exit
 docker build -t USER/dotnet-env .
-``` 
+```
+
 After the build finishes push the new image to a Docker registry using the 
 standard procedure.
 
diff --git a/environments/dotnet/build.sh b/environments/dotnet/build.sh
deleted file mode 100755
index b10b28bc..00000000
--- a/environments/dotnet/build.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/sh
-
-# clean up
-rm -rf bin obj out
-
diff --git a/environments/dotnet20/README.md b/environments/dotnet20/README.md
index 889c94ea..040b9ab5 100644
--- a/environments/dotnet20/README.md
+++ b/environments/dotnet20/README.md
@@ -35,54 +35,17 @@ Please see examples below.
 
 ## Rebuilding and pushing the image
 
-To rebuild the image you need either a computer with dotnet core 2.0.0
-installed or else you will have to map the source directory into a
-container containing the dotnet core 2.0.0 environment.
+To rebuild the image you will have to install Docker with version higher than 17.05+
+in order to support multi-stage builds feature.  
 
-### Locally installed Dotnet core 2.0.0
+### Rebuild containers
 
-Simply move to the source directory in a terminal and run the ./build.sh script.
-
-The script will restore dependencies, compile a release build and
-and build the container. If you need to change the name of the container
-simply change it in the script.
-
-After the build finishes push the new image to a Docker registry using the 
-standard procedure.
-
-### Build in a container
-
-Move to the directory containing the source and start the Docker container
-with dotnet and mount the current directory to a build location:
+Move to the directory containing the source and start the container build process:
 
 ```
-docker run -it --rm -v $PWD:/build microsoft/dotnet
-```
-
-Move to the build directory inside the container and restore the packages:
-
-```
-cd /build 
-dotnet restore fission-dotnet20.csproj
-log  : Restoring packages for /source/project.json...
-log  : Installing System.Net.WebSockets 4.0.0.
-log  : Installing runtime.native.System.IO.Compression 4.1.0.
-...
-```
-
-Compile and publish a release build of the source to the 'out' folder:
-
-```
-dotnet publish -c Release -o out
-Publishing source for .NETCoreApp,Version
-...
-```
-Exit the build container and build the Docker container on the local host:
-
-```
-exit
 docker build -t USER/dotnet20-env .
-``` 
+```
+
 After the build finishes push the new image to a Docker registry using the 
 standard procedure.
 
diff --git a/environments/dotnet20/build.sh b/environments/dotnet20/build.sh
deleted file mode 100755
index d29d60c5..00000000
--- a/environments/dotnet20/build.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-
-# clean up
-rm -rf bin obj out
diff --git a/environments/perl/README.md b/environments/perl/README.md
index d7704c3b..85bdd640 100644
--- a/environments/perl/README.md
+++ b/environments/perl/README.md
@@ -9,6 +9,12 @@ It is implemented using the lightweight web application framework
 Since Twiggy is implemented with [AnyEvent](https://metacpan.org/pod/AnyEvent),
 you can write async code using AnyEvent in your function.
 
+## Build this image
+   
+```
+docker build -t USER/perl . && docker push USER/perl
+```
+
 ## Usage
 
 The function you upload is actually a perl package returning a coderef (see the