diff --git a/ChangeLog b/ChangeLog
index d9a915dad7..dbc18cb873 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Feb 24 09:05:40 2012  Eric Hodel  <drbrain@segment7.net>
+
+	* complex.c (Init_Complex):  Document Complex::I.  Patch by Sylvain
+	  Daubert.  [Feature #5623]
+
 Fri Feb 24 08:52:09 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (parser_tokadd_string, parser_yylex): insert a backslash
diff --git a/complex.c b/complex.c
index 29652c5e4c..7f2d79b6d2 100644
--- a/complex.c
+++ b/complex.c
@@ -1981,6 +1981,9 @@ Init_Complex(void)
     rb_define_method(rb_cFloat, "angle", float_arg, 0);
     rb_define_method(rb_cFloat, "phase", float_arg, 0);
 
+    /*
+     * (0+1i)
+     */
     rb_define_const(rb_cComplex, "I",
 		    f_complex_new_bang2(rb_cComplex, ZERO, ONE));
 }