diff --git a/util/ceg/assemble/as_assemble/assemble.c b/util/ceg/assemble/as_assemble/assemble.c
index 1a7500fc4..de40e1376 100644
--- a/util/ceg/assemble/as_assemble/assemble.c
+++ b/util/ceg/assemble/as_assemble/assemble.c
@@ -3,9 +3,18 @@
 #include "em_decl.h"
 #include "as.h"
 
+/* This file contains the assemble routine that generates assembly code.
+ * As 'str' is in assembly format this is a easy job. Only operands 
+ * with "$n" in it need some special treatment. 
+ * Note : a '$' is qouted by prefixing it with a '$'.
+ */
 
 assemble( str)
 char *str;
+
+/* Output assembly instruction. Substitute for '$n' the name of the
+ * the n-th argument of the current EM-instruction.
+ */
 {
 	char buf[512] , *b_ptr, *arg_format();
 	int nr;
@@ -20,7 +29,7 @@ char *str;
 				        *b_ptr++ = '$';
 					str = str + 2;
 			       	}
-			      	else {
+			      	else {  
 					nr = atoi( str+1) - 1;
 					*b_ptr = '\0';
 					out( "%s%s\", %s);", buf,
diff --git a/util/ceg/assemble/as_assemble/block_as.c b/util/ceg/assemble/as_assemble/block_as.c
index 2b93b4d36..ea625ff56 100644
--- a/util/ceg/assemble/as_assemble/block_as.c
+++ b/util/ceg/assemble/as_assemble/block_as.c
@@ -1,4 +1,10 @@
 block_assemble( instructions, nr, first, last)
+
+/* Assemble a block of assembly instructions. If the table writer wants to
+ * combine assembly instructions he must rewrite this routine to fulfill his
+ * own needs.
+ */
+
 char **instructions;
 int nr, first, last;
 {