diff --git a/node/README.md b/node/README.md
index 1a473a65a..b98f320f9 100644
--- a/node/README.md
+++ b/node/README.md
@@ -48,7 +48,7 @@ software such as Apache.
 
 You can then build and run the Docker image:
 
-    docker build -t my-nodejs-app
+    docker build -t my-nodejs-app .
     docker run -it --rm --name my-running-app my-nodejs-app
 
 ### Notes
diff --git a/node/content.md b/node/content.md
index 4beaf447d..c0177a694 100644
--- a/node/content.md
+++ b/node/content.md
@@ -30,7 +30,7 @@ software such as Apache.
 
 You can then build and run the Docker image:
 
-    docker build -t my-nodejs-app
+    docker build -t my-nodejs-app .
     docker run -it --rm --name my-running-app my-nodejs-app
 
 ### Notes
diff --git a/perl/README.md b/perl/README.md
index 66b4fe64c..585515b87 100644
--- a/perl/README.md
+++ b/perl/README.md
@@ -32,7 +32,7 @@ including C, shell scripting (sh), AWK, and sed.
 
 Then, build and run the Docker image:
 
-    docker build -t my-perl-app
+    docker build -t my-perl-app .
     docker run -it --rm --name my-running-app my-perl-app
 
 ## Run a single Perl script
diff --git a/perl/content.md b/perl/content.md
index 517a42948..9a0ca6a5f 100644
--- a/perl/content.md
+++ b/perl/content.md
@@ -19,7 +19,7 @@ including C, shell scripting (sh), AWK, and sed.
 
 Then, build and run the Docker image:
 
-    docker build -t my-perl-app
+    docker build -t my-perl-app .
     docker run -it --rm --name my-running-app my-perl-app
 
 ## Run a single Perl script
diff --git a/python/README.md b/python/README.md
index c502c96d9..0c7ae698a 100644
--- a/python/README.md
+++ b/python/README.md
@@ -47,7 +47,7 @@ to bootstrap most applications. The build will `COPY` a `requirements.txt` file,
 
 You can then build and run the Docker image:
 
-    docker build -t my-python-app
+    docker build -t my-python-app .
     docker run -it --rm --name my-running-app my-python-app
 
 ## Run a single Python script
diff --git a/python/content.md b/python/content.md
index 2e8b14d95..d25bfa0e2 100644
--- a/python/content.md
+++ b/python/content.md
@@ -32,7 +32,7 @@ to bootstrap most applications. The build will `COPY` a `requirements.txt` file,
 
 You can then build and run the Docker image:
 
-    docker build -t my-python-app
+    docker build -t my-python-app .
     docker run -it --rm --name my-running-app my-python-app
 
 ## Run a single Python script