diff --git a/schlib/rules/S6_3.py b/schlib/rules/S6_3.py
index 995f4688..db52bb1e 100644
--- a/schlib/rules/S6_3.py
+++ b/schlib/rules/S6_3.py
@@ -74,6 +74,17 @@ def checkDocumentation(self, name, documentation, alias=False, isGraphicOrPowerS
             if not link:
                 warnings.append("Datasheet entry '{ds}' does not look like a URL".format(ds=ds))
 
+        # Handle keyword seperator. Right now it filters based on a regular
+        # expression based on certain symbols. Right now hyphen (-) is still allowed.
+        try:
+            keywords = documentation.get('keywords', '')
+            forbidden_matches = re.findall('[,.:;?!<>]', keywords)
+            if forbidden_matches:
+                errors.append("Symbol keywords contain forbidden symbols: {}".format(forbidden_matches))
+        except:
+            warnings.append("Symbol appears to not have any keywords.")
+
+
         if len(errors) > 0 or len(warnings) > 0:
             msg = "{cmp} {name} has metadata errors:".format(
                 cmp="ALIAS" if alias else "Component",
diff --git a/schlib/rules/rule.py b/schlib/rules/rule.py
index ad1d12c3..307e3564 100644
--- a/schlib/rules/rule.py
+++ b/schlib/rules/rule.py
@@ -2,6 +2,7 @@
 
 import sys
 import os
+import re
 
 common = os.path.abspath(os.path.join(sys.path[0], '..', 'common'))