diff --git a/top/top.1 b/top/top.1
index d6b35cfd..ae393fa7 100644
--- a/top/top.1
+++ b/top/top.1
@@ -381,6 +381,9 @@ Display only processes with a user id or user name matching that given.
 The '\-u' option matches on \fI effective\fR user whereas the '\-U' option
 matches on\fI any\fR user (real, effective, saved, or filesystem).
 
+Prepending an exclamation point ('!') to the user id or name instucts top to
+display only processes with users not matching the one provided.
+
 The 'p', 'u' and 'U' \*(COs are mutually exclusive.
 
 .TP 5
@@ -1296,8 +1299,10 @@ matches on\fB any\fR user (real, effective, saved, or filesystem).
 
 Thereafter, in that \*(TW only matching users will be shown, or possibly
 no processes will be shown.
-Different \*(TWs can can be used to filter different users.
+Prepending an exclamation point ('!') to the user id or name instucts top
+to display only processes with users not matching the one provided.
 
+Different \*(TWs can can be used to filter different users.
 Later, if you wish to monitor all tasks again in the \*(CW, re-issue this
 command but just press <Enter> at the prompt.
 
diff --git a/top/top.c b/top/top.c
index a21cf770..95f7da80 100644
--- a/top/top.c
+++ b/top/top.c
@@ -1218,8 +1218,10 @@ static const char *user_certify (WIN_t *q, const char *str, char typ) {
    uid_t num;
 
    q->usrseltyp = 0;
+   q->usrselflg = 1;
    Monpidsidx = 0;
    if (*str) {
+      if ('!' == *str) { ++str; q->usrselflg = 0; }
       num = (uid_t)strtoul(str, &endp, 0);
       if ('\0' == *endp) {
          pwd = getpwuid(num);
@@ -1247,19 +1249,19 @@ static const char *user_certify (WIN_t *q, const char *str, char typ) {
 static inline int user_matched (WIN_t *q, const proc_t *p) {
    switch(q->usrseltyp) {
       case 0:                                    // uid selection inactive
-         return 1;
+         return q->usrselflg;
       case 'U':                                  // match any uid
-         if (p->ruid == q->usrseluid) return 1;
-         if (p->suid == q->usrseluid) return 1;
-         if (p->fuid == q->usrseluid) return 1;
+         if (p->ruid == q->usrseluid) return q->usrselflg;
+         if (p->suid == q->usrseluid) return q->usrselflg;
+         if (p->fuid == q->usrseluid) return q->usrselflg;
       // fall through...
       case 'u':                                  // match effective uid
-         if (p->euid == q->usrseluid) return 1;
+         if (p->euid == q->usrseluid) return q->usrselflg;
       // fall through...
-      default:                                   // no match, don't display
+      default:                                   // no match...
          ;
    }
-   return 0;
+   return !q->usrselflg;
 } // end: user_matched
 
 /*######  Basic Formatting support  ######################################*/
diff --git a/top/top.h b/top/top.h
index b6b04469..381594bf 100644
--- a/top/top.h
+++ b/top/top.h
@@ -371,6 +371,7 @@ typedef struct WIN_t {
           varcolsz,        // max length of variable width column(s)
           usrseluid,       // validated uid for 'u/U' user selection
           usrseltyp,       // the basis for matching above uid
+          usrselflg,       // flag denoting include/exclude matches
           hdrcaplen;       // column header xtra caps len, if any
    char   capclr_sum [CLRBUFSIZ],      // terminfo strings built from
           capclr_msg [CLRBUFSIZ],      //   RCW_t colors (& rebuilt too),