diff --git a/all.sas b/all.sas
index f36e771..08b7d69 100644
--- a/all.sas
+++ b/all.sas
@@ -1684,7 +1684,7 @@ Usage:
 
   Usage:
 
-      %put mf_isblank(&var);
+      %put %mf_isblank(&var);
 
   inspiration:
   https://support.sas.com/resources/papers/proceedings09/022-2009.pdf
diff --git a/base/mf_isblank.sas b/base/mf_isblank.sas
index 5dd0eed..78d7e80 100644
--- a/base/mf_isblank.sas
+++ b/base/mf_isblank.sas
@@ -7,7 +7,7 @@
 
   Usage:
 
-      %put mf_isblank(&var);
+      %put %mf_isblank(&var);
 
   inspiration:
   https://support.sas.com/resources/papers/proceedings09/022-2009.pdf