diff --git a/doc/ca65.sgml b/doc/ca65.sgml
index 52dcccc6b..a40bcddff 100644
--- a/doc/ca65.sgml
+++ b/doc/ca65.sgml
@@ -2316,7 +2316,7 @@ Here's a list of all control commands and a description, what they do:
   </verb></tscreen>
 
 
-<sect1><tt>.DEFINEDINSTR</tt><label id=".DEFINEDINSTR"><p>
+<sect1><tt>.ISMNEM, .ISMNEMONIC</tt><label id=".ISMNEMONIC"><p>
 
   Builtin function. The function expects an identifier as argument in braces.
   The argument is evaluated, and the function yields "true" if the identifier
@@ -2324,7 +2324,7 @@ Here's a list of all control commands and a description, what they do:
   Example:
 
   <tscreen><verb>
-  	.if  	.not .definedinstr(ina)
+  	.if  	.not .ismnemonic(ina)
   	  	.macro ina
   	  	  	clc
   	  	  	adc #$01