diff --git a/conf.c b/conf.c
index 1972287..3078321 100644
--- a/conf.c
+++ b/conf.c
@@ -430,6 +430,10 @@ conf_mousebind(struct conf *c, char *name, char *binding)
 	    strchr(name, 'M') < strchr(name, '-'))
 		current_binding->modmask |= Mod1Mask;
 
+	if (strchr(name, 'S') != NULL &&
+	    strchr(name, 'S') < strchr(name, '-'))
+		current_binding->modmask |= ShiftMask;
+
 	substring = strchr(name, '-') + 1;
 
 	if (strchr(name, '-') == NULL)
diff --git a/cwmrc.5 b/cwmrc.5
index fe2f205..9a421ae 100644
--- a/cwmrc.5
+++ b/cwmrc.5
@@ -139,6 +139,8 @@ The following modifiers are recognised:
 The Control key.
 .It M
 The Meta key.
+.It S
+The Shift key.
 .El
 .Pp
 The