diff --git a/bip-0347.mediawiki b/bip-0347.mediawiki
index e43bd72f..24df6456 100644
--- a/bip-0347.mediawiki
+++ b/bip-0347.mediawiki
@@ -20,7 +20,7 @@ This document is licensed under the 3-clause BSD license.
 
 ==Specification==
 
-When evaluated the OP_CAT instruction:
+When evaluated, the OP_CAT instruction:
 # Pops the top two values off the stack,
 # concatenates the popped values together in stack order,
 # and then pushes the concatenated value on the top of the stack.