diff --git a/pisi-spec.dtd b/pisi-spec.dtd
index e215c0e8..f5dbc925 100644
--- a/pisi-spec.dtd
+++ b/pisi-spec.dtd
@@ -52,6 +52,10 @@
 <!ATTLIST Archive type CDATA #REQUIRED>
 <!ATTLIST Archive target CDATA #IMPLIED>
 
+<!ELEMENT BuildFlags (Flag*)>
+
+<!ELEMENT Flag (#PCDATA)>
+
 <!ELEMENT BuildType (#PCDATA)>
 
 <!ELEMENT BuildDependencies (Dependency*)>
@@ -84,6 +88,7 @@
 	PartOf |
 	Summary |
 	Description |
+	BuildFlags |
 	BuildType |
 	BuildDependencies |
 	RuntimeDependencies |
diff --git a/pisi-spec.rng b/pisi-spec.rng
index 0d3c6381..75118884 100644
--- a/pisi-spec.rng
+++ b/pisi-spec.rng
@@ -85,6 +85,9 @@
             <zeroOrMore>
                 <ref name="Description"/>
             </zeroOrMore>
+            <optional>
+                <ref name="BuildFlags"/>
+            </optional>
             <optional>
                 <ref name="BuildType"/>
             </optional>
@@ -1339,6 +1342,25 @@
         </group>
     </define>
 
+    <!-- BuildFlags -->
+    <define name="BuildFlags">
+        <element name="BuildFlags">
+            <oneOrMore>
+                <ref name="Flag"/>
+            </oneOrMore>
+        </element>
+    </define>
+
+    <!-- Flag -->
+    <define name="Flag">
+        <element name="Flag">
+            <choice>
+                <value>noDebug</value>
+                <value>noDelta</value>
+            </choice>
+        </element>
+    </define>
+
     <!-- BuildType -->
     <define name="BuildType">
         <element name="BuildType">