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-rw-r--r--collections/map/map.adoc3
1 files changed, 3 insertions, 0 deletions
diff --git a/collections/map/map.adoc b/collections/map/map.adoc
index 27278b8..695f763 100644
--- a/collections/map/map.adoc
+++ b/collections/map/map.adoc
@@ -9,6 +9,9 @@ NOTE: Keys are passed as void pointers and their data is not copied (this
should be handled by the user), they should not be freed without clearing the
map.
+NOTE: NULL keys are used to distingish a empty map, therefore NULL keys should
+never be used.
+
NOTE: There is currently no way to distinquish between a failed retrieval
(pop, index, back, etc.) and returning a NULL value. Keep this in mind if
you plan on storing NULL values in the vector, there are plans to fix this in