diff --git a/core-functions.md b/core-functions.md
index ae9f4dd..36aefe0 100644
--- a/core-functions.md
+++ b/core-functions.md
@@ -18,11 +18,11 @@ Public. Takes two arguments, a key and a store. The store may either be a CONS f
 
 # (car arg)
 
-Public. Takes one argument. If that argument is a CONS cell and is readable by the current user, returns the value indicated by the first pointer of that cell, else NIL.
+Public. Takes one argument. If that argument is a CONS cell and is readable by the current user, returns the value indicated by the first pointer of that cell; if the argument is an STRG and is readable by the user, a CHAR representing the first character in the string; else NIL. 
 
 # (cdr arg)
 
-Public. Takes one argument. If that argument is a CONS cell and is readable by the current user, returns the value indicated by the second pointer of that cell, else NIL.
+Public. Takes one argument. If that argument is a CONS or STRG cell and is readable by the current user, returns the value indicated by the second pointer of that cell, else NIL.
 
 # (cond args...)