Added note about when to include

1 files changed, 7 insertions, 0 deletions

diff --git a/src/myqhash.h b/src/myqhash.h
index 13eba09..9156ec2 100644
--- a/src/myqhash.h
+++ b/src/myqhash.h
@@ -1,6 +1,13 @@
 #ifndef OPENSCAD_QHASH_H_
 #define OPENSCAD_QHASH_H_
 
+/*!
+	Defines a qHash for std::string.
+
+	Note that this header must be included before Qt headers (at least
+	before qhash.h) to take effect.
+ */
+
 #include <qglobal.h>
 #include <string>
 extern uint qHash(const std::string &);