diff --git a/passes/pmgen/README.md b/passes/pmgen/README.md
index d0711c730..2f0b1fd5a 100644
--- a/passes/pmgen/README.md
+++ b/passes/pmgen/README.md
@@ -232,5 +232,5 @@ But in some cases it is more natural to utilize the implicit branch statement:
         portAB = \B;
     endcode
 
-There is an implicit `code..endcode` block at the end of each `.pgm` file
+There is an implicit `code..endcode` block at the end of each `.pmg` file
 that just accepts everything that gets all the way there.