diff --git a/awesomerc.1.txt b/awesomerc.1.txt
index 1135ffd1f..39e9f4113 100644
--- a/awesomerc.1.txt
+++ b/awesomerc.1.txt
@@ -519,10 +519,10 @@ rules
         xproperty_name = <string>
         xproperty_value = <regex>
         float = <{auto,true,false}>
+        master = <{auto,true,false}>
         tags = <regex>
         screen = <integer>
         icon = <image>
-        not_master = <boolean>
         opacity = <float>
     }
 }
diff --git a/client.c b/client.c
index 2c2c2e388..0e7fe9ca2 100644
--- a/client.c
+++ b/client.c
@@ -351,10 +351,10 @@ client_manage(Window w, XWindowAttributes *wa, int screen)
             {
               case Auto:
                 break;
-              case Float:
+              case Yes:
                 client_setfloating(c, True);
                 break;
-              case Tile:
+              case No:
                 client_setfloating(c, False);
                 break;
             }
@@ -391,12 +391,27 @@ client_manage(Window w, XWindowAttributes *wa, int screen)
     }
 
     /* attach to the stack */
-    if((rule = rule_matching_client(c)) && rule->not_master)
-        client_list_append(&globalconf.clients, c);
-    else if(globalconf.screens[c->screen].new_become_master)
-        client_list_push(&globalconf.clients, c);
-    else
-        client_list_append(&globalconf.clients, c);
+    if((rule = rule_matching_client(c)))
+        switch(rule->ismaster)
+        {
+          case Yes:
+            client_list_push(&globalconf.clients, c);
+            break;
+          case No:
+            client_list_append(&globalconf.clients, c);
+            break;
+          case Auto:
+            rule = NULL;
+            break;
+        }
+
+    if(!rule)
+    {
+        if(globalconf.screens[c->screen].new_become_master)
+            client_list_push(&globalconf.clients, c);
+        else
+            client_list_append(&globalconf.clients, c);
+    }
 
     /* some windows require this */
     XMoveResizeWindow(globalconf.display, c->win, c->geometry.x, c->geometry.y,
diff --git a/common/configopts.c b/common/configopts.c
index fa1f2b1a6..608939a92 100644
--- a/common/configopts.c
+++ b/common/configopts.c
@@ -238,8 +238,8 @@ cfg_opt_t rule_opts[] =
     CFG_STR((char *) "tags", NULL, CFGF_NONE),
     CFG_STR((char *) "icon", NULL, CFGF_NONE),
     CFG_STR((char *) "float", (char *) "auto", CFGF_NONE),
+    CFG_STR((char *) "master", (char *) "auto", CFGF_NONE),
     CFG_INT((char *) "screen", RULE_NOSCREEN, CFGF_NONE),
-    CFG_BOOL((char *) "not_master", cfg_false, CFGF_NONE),
     CFG_FLOAT((char *) "opacity", -1.0f, CFGF_NONE),
     CFG_END()
 };
diff --git a/config.c b/config.c
index a95eadaa7..c1f875aed 100644
--- a/config.c
+++ b/config.c
@@ -494,9 +494,9 @@ config_parse(const char *confpatharg)
         rule->xprop = a_strdup(cfg_getstr(cfgsectmp, "xproperty_name"));
         rule->xpropval_r = rules_compile_regex(cfg_getstr(cfgsectmp, "xproperty_value"));
         rule->icon = a_strdup(cfg_getstr(cfgsectmp, "icon"));
-        rule->isfloating = rules_get_float_from_str(cfg_getstr(cfgsectmp, "float"));
+        rule->isfloating = rules_get_fuzzy_from_str(cfg_getstr(cfgsectmp, "float"));
         rule->screen = cfg_getint(cfgsectmp, "screen");
-        rule->not_master = cfg_getbool(cfgsectmp, "not_master");
+        rule->ismaster = rules_get_fuzzy_from_str(cfg_getstr(cfgsectmp, "master"));
         rule->opacity = cfg_getfloat(cfgsectmp, "opacity");
         if(rule->screen >= globalconf.nscreen)
             rule->screen = 0;
diff --git a/rules.c b/rules.c
index ab080f76d..5cd5305d1 100644
--- a/rules.c
+++ b/rules.c
@@ -107,13 +107,13 @@ rule_matching_client(Client *c)
     return NULL;
 }
 
-RuleFloat
-rules_get_float_from_str(const char *str)
+Fuzzy
+rules_get_fuzzy_from_str(const char *str)
 {
     if(!a_strcmp(str, "true") || !a_strcmp(str, "yes"))
-        return Float;
+        return Yes;
     else if(!a_strcmp(str, "false") || !a_strcmp(str, "no"))
-        return Tile;
+        return No;
 
     return Auto;
 }
diff --git a/rules.h b/rules.h
index 90e4f6ecb..2a6293504 100644
--- a/rules.h
+++ b/rules.h
@@ -28,7 +28,7 @@
 
 regex_t * rules_compile_regex(char *);    
 Bool tag_match_rule(Tag *, Rule *);
-RuleFloat rules_get_float_from_str(const char *);
+Fuzzy rules_get_fuzzy_from_str(const char *);
 Rule * rule_matching_client(Client *);
 
 DO_SLIST(Rule, rule, p_delete);
diff --git a/structs.h b/structs.h
index 8d932826d..179af0026 100644
--- a/structs.h
+++ b/structs.h
@@ -40,10 +40,10 @@ typedef enum
 /** Rules for floating rule */
 typedef enum
 {
-    Float,
-    Tile,
-    Auto,
-} RuleFloat;
+    Yes,
+    No,
+    Auto
+} Fuzzy;
 
 /** Common colors */
 enum
@@ -60,8 +60,8 @@ struct Rule
     char *icon;
     char *xprop;
     int screen;
-    RuleFloat isfloating;
-    Bool not_master;
+    Fuzzy isfloating;
+    Fuzzy ismaster;
     double opacity;
     regex_t *prop_r;
     regex_t *tags_r;