Update README.md

README.md

@@ -105,7 +105,7 @@ Graphs
 
 **Dijkstra’s Algorithm** - Create a program that finds the shortest path through a graph using its edges.
 
-Information Retrieval
+Data Structures
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 **Inverted index** - An [Inverted Index](http://en.wikipedia.org/wiki/Inverted_index) is a data structure used to create full text search. Given a set of text files, implement a program to create an inverted index. Also create a user interface to do a search using that inverted index which returns a list of files that contain the query term / terms. The search index can be in memory.