diff --git a/src/rpn-algebra.h b/src/rpn-algebra.h
index e8cf08e..cc8f126 100644
--- a/src/rpn-algebra.h
+++ b/src/rpn-algebra.h
@@ -179,3 +179,14 @@ void square()
     floating_t first = getf();
     putf(first * first);
 }
+
+void modulo()
+{
+    MIN_ARGUMENTS(2);
+    ARG_MUST_BE_OF_TYPE(0, cmd_number);
+    ARG_MUST_BE_OF_TYPE(1, cmd_number);
+
+    // arithmetic faults are managed by c++
+    floating_t first = getf();
+    putf(fmodl(getf(), first));
+}
diff --git a/src/rpn-cmd.h b/src/rpn-cmd.h
index 259ce23..6c7c0b3 100644
--- a/src/rpn-cmd.h
+++ b/src/rpn-cmd.h
@@ -30,6 +30,7 @@ program::keyword_t program::_keywords[] =
     { cmd_keyword, "^", &program::power, "binary operator power" },
     { cmd_keyword, "sqrt", &program::squareroot, "unarity operator square root" },
     { cmd_keyword, "sq", &program::square, "unarity operator square" },
+    { cmd_keyword, "mod", &program::modulo, "binary operator modulo" },
 
     //BINARY
     { cmd_undef, "", NULL, "\nBINARY"},
diff --git a/src/version.h b/src/version.h
index 0aaf505..76f8d19 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,13 +1,16 @@
 // version and soft name
-static const char version[] = "1.3.2";
-static const char uname[] = "rpn v1.3.2, (c) 2015 <louis@rubet.fr>";
+static const char version[] = "1.3.3";
+static const char uname[] = "rpn v1.3.3, (c) 2015 <louis@rubet.fr>";
 
 static const char g_cursor[] = "> ";
 static const string g_show_stack_separator = "> ";
 
 // syntax
 static const char* syntax[] = {
-    "Reverse Polish Notation language, based on hewlett-Packard RPL",
+    ATTR_BOLD "R" ATTR_OFF "everse "
+    ATTR_BOLD "P" ATTR_OFF "olish "
+    ATTR_BOLD "N" ATTR_OFF "otation language, based on hewlett-Packard RPL",
+    "",
     "Syntax: rpn [command]",
     "with optional command = list of commands",
     NULL