--- check.c
+++ check.c
@@ -207,6 +207,11 @@
 		    len += strlen(*user_runas) - 2;
 		    subst = 1;
 		    break;
+		case 'p':
+		    p++;
+		    len += strlen(auth_pw->pw_name) - 2;
+		    subst = 1;
+		    break;
 		case '%':
 		    p++;
 		    len--;
@@ -252,6 +257,13 @@
 			    goto oflow;
 			np += n;
 			continue;
+		    case 'p':
+			p++;
+			n = strlcpy(np, auth_pw->pw_name, np - endp);
+			if (n >= np - endp)
+			    goto oflow;
+			np += n;
+			continue;
 		    case '%':
 			/* convert %% -> % */
 			p++;
--- sudoers.man.in
+++ sudoers.man.in
@@ -663,6 +663,11 @@
 .IX Item "%U"
 expanded to the login name of the user the command will
 be run as (defaults to root)
+.ie n .IP "%p" 8
+.el .IP "\f(CW%p\fR" 8
+.IX Item "%p"
+expanded to the login name of the user whose password
+is requested
 .ie n .IP "%h" 8
 .el .IP "\f(CW%h\fR" 8
 .IX Item "%h"