diff --git a/.gitignore b/.gitignore
index 5a1b4f1..bf77c8f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ diagnostic.test
 tests/*.diff
 spec/
 spec-runner/
+demo/sourcing.vars
diff --git a/demo/sourcing b/demo/sourcing
new file mode 100755
index 0000000..01cfb6a
--- /dev/null
+++ b/demo/sourcing
@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+# This sources a simple script with the env. variables needed for the template.
+
+cd "$(dirname "$0")" # Go to the script's directory
+
+cat <<EOF >sourcing.vars
+export NAME="Alex"
+export ARRAY=( AAA BBB CCC )
+EOF
+
+cat <<EOF | ../mo --source=sourcing.vars
+Hello, my name is {{NAME}}.
+And this is ARRAY's conntents:
+{{#ARRAY}}
+    * {{.}}
+{{/ARRAY}}
+EOF
\ No newline at end of file
diff --git a/mo b/mo
index 598c566..1ca2ab9 100755
--- a/mo
+++ b/mo
@@ -21,7 +21,9 @@
 #
 # $0 - Name of the mo file, used for getting the help message.
 # $* - Filenames to parse.  Can use -h or --help as the only option
-#      in order to show a help message.
+#      in order to show a help message. Additionaly, --source=file
+#      can be passed so that mo sources the file before parsing
+#      the filenames.
 #
 # Returns nothing.
 mo() (
@@ -30,13 +32,18 @@ mo() (
     local moContent
 
     IFS=$' \n\t'
-    
+
     if [[ $# -gt 0 ]]; then
         case "$1" in
             -h|--h|--he|--hel|--help)
                 moUsage "$0"
                 exit 0
                 ;;
+
+            --source=*)
+                . "${1#--source=}"
+                shift 1
+                ;;
         esac
     fi