diff --git a/java/ql/src/semmle/code/java/security/CommandArguments.qll b/java/ql/src/semmle/code/java/security/CommandArguments.qll
index fa659d1694c..6a3b224f408 100644
--- a/java/ql/src/semmle/code/java/security/CommandArguments.qll
+++ b/java/ql/src/semmle/code/java/security/CommandArguments.qll
@@ -1,3 +1,6 @@
+/** 
+ * Definitions for reasoning about lists and arrays that are to be used as arguments to an external process.
+ */
 import java
 import semmle.code.java.dataflow.SSA
 import semmle.code.java.Collections