diff --git a/.github/workflows/lint-patterns.yml b/.github/workflows/lint-patterns.yml
new file mode 100644
index 000000000..c8140e85e
--- /dev/null
+++ b/.github/workflows/lint-patterns.yml
@@ -0,0 +1,32 @@
+# from: https://github.com/marketplace/actions/markdown-linting-action
+
+name: Validate pattern syntax
+
+on: [push, pull_request]
+jobs:
+  validate-pattern-syntax:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+    - name: Problem Matcher for markdownlint-cli
+      uses: xt0rted/markdownlint-problem-matcher@v1
+    - name: Lint pattern files (markdown)
+      uses: avto-dev/markdown-lint@v1
+      with:
+        rules: './lint/pattern-template.js'
+        config: './lint/pattern-template.yml'
+        # ignore-path: './lint/.markdownlintignore'
+        ignore: "+(README|CONTRIBUTING|TRUSTED-COMMITTERS).md"
+        args: './*.md'
+
+#
+# on: push
+# jobs:
+#   build:
+#     runs-on: ubuntu-latest
+#     steps:
+#       - uses: actions/checkout@v2
+#       - uses: xt0rted/markdownlint-problem-matcher@v1
+#       - run: npm install -g markdownlint-cli
+#       - run: markdownlint --ignore-path ./lint/.markdownlintignore -r ./lint/pattern-template.js -c ./lint/pattern-template.yml ./*.md
diff --git a/crossteam-project-valuation.md b/crossteam-project-valuation.md
index 6eec411fa..23bc7178d 100644
--- a/crossteam-project-valuation.md
+++ b/crossteam-project-valuation.md
@@ -7,3 +7,7 @@ Cross Team Valuation
 It's hard to sell the value of cross-team, inner sourced projects that don't provide a direct impact on company revenue. Here's a data-driven way to represent your project that both articulates its value and amplifies it.
 
 **This pattern is currently [under development in a Pull Request](https://github.com/InnerSourceCommons/InnerSourcePatterns/pull/87)**
+
+# markdownlint tester
+
+This is just a test.
diff --git a/lint/.markdownlintignore b/lint/.markdownlintignore
new file mode 100644
index 000000000..1ae3df4ef
--- /dev/null
+++ b/lint/.markdownlintignore
@@ -0,0 +1,4 @@
+**/README.md
+**/TRUSTED-COMMITTERS.md
+**/CONTRIBUTING.md
+**/IS.*
diff --git a/lint/pattern-template.js b/lint/pattern-template.js
new file mode 100644
index 000000000..5cc60d3c3
--- /dev/null
+++ b/lint/pattern-template.js
@@ -0,0 +1,117 @@
+"use strict";
+
+module.exports = [
+{
+    names: ["PATTERN-TEMPLATE-RULE-001"],
+    description: "No h1 headlines",
+    tags: ["headings", "headers", "pattern-template"],
+    function: (params, onError) => {
+        params.tokens.filter(function filterToken(token) {
+            return token.type === "heading_open";
+        }).forEach(function forToken(token) {
+            if (token.tag === "h1") {
+                return onError({
+                    lineNumber: token.lineNumber,
+                    detail: "Use of #-headlines (h1) is not allowed in patterns",
+                    context: token.line
+                });
+            }
+        });
+    }
+},
+{
+    names: ["PATTERN-TEMPLATE-RULE-002"],
+    description: "Standard Headlines",
+    tags: ["headings", "headers", "pattern-template"],
+    function: (params, onError) => {
+        var allowedHeadlines = "Title|Patlet|Problem|Story|Context|Forces|Solutions|Resulting Context|Known Instances|Status|Author(s)|Acknowledgements";
+        var re = new RegExp(`^## (${allowedHeadlines.replace(/(?=[\(\)])/g, '\\')})\\s*$`,"m");
+        // console.log(re);
+
+        params.tokens.filter(function filterToken(token) {
+            return token.type === "heading_open";
+        }).forEach(function forToken(token) {
+            if (token.tag === "h2") {
+                if (re.test(token.line)) {
+                    return;
+                }
+                // if (/^## ()$/m.test(token.line)) {
+                //     return;
+                // }
+
+                return onError({
+                    lineNumber: token.lineNumber,
+                    detail: "Allowed types are: " + allowedHeadlines.replace(/\|/g, ', '),
+                    context: token.line
+                });
+            }
+        });
+    }
+},
+{
+    names: ["PATTERN-TEMPLATE-RULE-003"],
+    description: "Mandatory template sections",
+    tags: ["headings", "headers", "pattern-template"],
+    function: (params, onError) => {
+        var mandatoryHeadlines = {
+          "Title": "Title",
+          "Patlet": "Patlet",
+          "Problem": "Problem",
+          "Context": "Context",
+          "Forces": "Forces",
+          "Solutions": "Solutions?",
+          "Resulting Context": "Resulting Context",
+          "Status": "Status",
+          "Author(s)": "(Author\\(s\\))|(Authors?)"
+        };
+
+        // console.log(mandatoryHeadlines);
+
+        var collectedHeadlines = ""
+
+        // collect all h2 headlines
+        // (only the headline text itself, removing markdown sytnax and whitespace)
+        params.tokens.filter(function filterToken(token) {
+            return token.type === "heading_open";
+        }).forEach(function forToken(token) {
+            if (token.tag === "h2") {
+                let re = new RegExp("^## (.*?)\\s*$","m");
+                let matchResult = token.line.match(re);
+
+                if (matchResult != null) {
+                  collectedHeadlines += matchResult[1] + "\n"
+                }
+            }
+        });
+
+        // confirm if all `mandatoryHeadlines` exist exactly once in the `collectedHeadlines`
+        var errorsFound = [];
+
+        let headline;
+        for (headline in mandatoryHeadlines){
+          // console.log(headline);
+          let pattern = mandatoryHeadlines[headline];
+          let re = new RegExp(`^${pattern}$`,"gm");
+          let matchResult = collectedHeadlines.match(re);
+
+          // TODO as soon as I use the option 'g' in the regexp, it does not return a full match array anymore
+          if (matchResult != null) {
+              if (matchResult.length >= 2 ) {
+                errorsFound.push(`Duplicate headline "${headline}".`);
+              }
+          }
+          else {
+            errorsFound.push(`Required headline "${headline}" is missing.`);
+          }
+        }
+
+        // if any errors were found, raise a linter error
+        if (errorsFound.length > 0) {
+          return onError({
+              lineNumber: 1,
+              detail: errorsFound.join(" ")
+          });
+        }
+    }
+}
+];
diff --git a/lint/pattern-template.yml b/lint/pattern-template.yml
new file mode 100644
index 000000000..61c05d28c
--- /dev/null
+++ b/lint/pattern-template.yml
@@ -0,0 +1,6 @@
+default: false # includes/excludes all rules by default
+
+# Custom rules:
+PATTERN-TEMPLATE-RULE-001: true
+# PATTERN-TEMPLATE-RULE-002: true
+PATTERN-TEMPLATE-RULE-003: true